<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Circuit Comparison: 1 Bulb vs 2 Bulbs in Series</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8fafc;
      color: #0f172a;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      padding: 12px 16px;
    }
    .diagram-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      width: 100%;
      max-width: 600px;
      align-items: start;
    }
    @media (max-width: 440px) {
      .diagram-grid {
        grid-template-columns: 1fr;
        gap: 16px;
      }
    }
    .circuit-col {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      background: transparent;
      border: none;
      box-shadow: none;
      padding: 0;
    }
    .title {
      font-size: 15px;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 6px;
    }
    .svg-wrap {
      width: 100%;
      max-width: 220px;
      height: auto;
      aspect-ratio: 1 / 1;
    }
    svg {
      width: 100%;
      height: 100%;
      overflow: visible;
      display: block;
    }
    .wire {
      fill: none;
      stroke: #475569;
      stroke-width: 3.5;
      stroke-linecap: round;
      stroke-linejoin: round;
    }
    .battery-body {
      fill: #1e293b;
      rx: 3;
    }
    .battery-pos {
      fill: #dc2626;
      rx: 1.5;
    }
    .battery-label {
      font-size: 11px;
      font-weight: 800;
      fill: #ffffff;
      text-anchor: middle;
      dominant-baseline: central;
      user-select: none;
    }
    .bulb-text {
      font-size: 10px;
      font-weight: 800;
      fill: #1e293b;
      text-anchor: middle;
      dominant-baseline: central;
    }
    .badge {
      margin-top: 6px;
      padding: 4px 12px;
      border-radius: 999px;
      font-size: 12px;
      font-weight: 700;
      text-align: center;
      display: inline-block;
    }
    .badge-bright {
      background: #fef3c7;
      color: #92400e;
      border: 1px solid #fcd34d;
    }
    .badge-dim {
      background: #e2e8f0;
      color: #1e293b;
      border: 1px solid #cbd5e1;
    }
    .shared-note {
      font-size: 12px;
      font-weight: 600;
      color: #334155;
      margin-top: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
      text-align: center;
    }

    /* Smooth, gentle glow pulses without rapid strobe */
    @keyframes pulse-bright {
      0%, 100% { transform: scale(1); opacity: 0.92; }
      50% { transform: scale(1.04); opacity: 1; }
    }
    @keyframes pulse-dim {
      0%, 100% { transform: scale(1); opacity: 0.65; }
      50% { transform: scale(1.03); opacity: 0.8; }
    }
    .glow-bright {
      transform-origin: 100px 42px;
      animation: pulse-bright 3.5s ease-in-out infinite;
    }
    .glow-dim-left {
      transform-origin: 65px 42px;
      animation: pulse-dim 3.5s ease-in-out infinite;
    }
    .glow-dim-right {
      transform-origin: 135px 42px;
      animation: pulse-dim 3.5s ease-in-out infinite;
    }
  </style>
</head>
<body>

  <div class="diagram-grid">
    
    <div class="circuit-col">
      <div class="title">1 Bulb Circuit</div>
      
      <div class="svg-wrap">
        <svg viewBox="0 0 200 200">
          <defs>
            <radialGradient id="glow100" cx="50%" cy="50%" r="50%">
              <stop offset="0%" stop-color="#fbbf24" stop-opacity="1" />
              <stop offset="50%" stop-color="#f59e0b" stop-opacity="0.5" />
              <stop offset="100%" stop-color="#f59e0b" stop-opacity="0" />
            </radialGradient>
          </defs>

          
          <path class="wire" d="M 100 160 L 35 160 L 35 42 L 86 42" />
          <path class="wire" d="M 114 42 L 165 42 L 165 160 L 100 160" />

          
          <rect class="battery-body" x="76" y="151" width="48" height="18" />
          <rect class="battery-pos" x="124" y="155" width="4" height="10" />
          <text class="battery-label" x="90" y="160">−</text>
          <text class="battery-label" x="112" y="160">+</text>

          
          <g class="glow-bright">
            <circle cx="100" cy="42" r="42" fill="url(#glow100)" />
            
            <line x1="100" y1="12" x2="100" y2="4" stroke="#d97706" stroke-width="2.5" stroke-linecap="round" />
            <line x1="122" y1="20" x2="128" y2="14" stroke="#d97706" stroke-width="2.5" stroke-linecap="round" />
            <line x1="78" y1="20" x2="72" y2="14" stroke="#d97706" stroke-width="2.5" stroke-linecap="round" />
            <line x1="130" y1="42" x2="138" y2="42" stroke="#d97706" stroke-width="2.5" stroke-linecap="round" />
            <line x1="70" y1="42" x2="62" y2="42" stroke="#d97706" stroke-width="2.5" stroke-linecap="round" />
          </g>

          
          <circle cx="100" cy="42" r="14" fill="#fef08a" stroke="#ca8a04" stroke-width="2" />
          <path d="M 95 45 Q 100 35 105 45" fill="none" stroke="#b45309" stroke-width="2" stroke-linecap="round" />
          <rect x="94" y="54" width="12" height="5" rx="1" fill="#64748b" />
        </svg>
      </div>

      <div class="badge badge-bright">100% Brightness</div>
    </div>

    
    <div class="circuit-col">
      <div class="title">2 Bulb Series Circuit</div>
      
      <div class="svg-wrap">
        <svg viewBox="0 0 200 200">
          <defs>
            <radialGradient id="glow50" cx="50%" cy="50%" r="50%">
              <stop offset="0%" stop-color="#fde047" stop-opacity="0.85" />
              <stop offset="60%" stop-color="#facc15" stop-opacity="0.3" />
              <stop offset="100%" stop-color="#facc15" stop-opacity="0" />
            </radialGradient>
          </defs>

          
          <path class="wire" d="M 100 160 L 35 160 L 35 42 L 53 42" />
          <path class="wire" d="M 77 42 L 123 42" />
          <path class="wire" d="M 147 42 L 165 42 L 165 160 L 100 160" />

          
          <rect class="battery-body" x="76" y="151" width="48" height="18" />
          <rect class="battery-pos" x="124" y="155" width="4" height="10" />
          <text class="battery-label" x="90" y="160">−</text>
          <text class="battery-label" x="112" y="160">+</text>

          
          <g class="glow-dim-left">
            <circle cx="65" cy="42" r="25" fill="url(#glow50)" />
          </g>
          
          <circle cx="65" cy="42" r="12" fill="#fef9c3" stroke="#ca8a04" stroke-width="1.8" />
          <path d="M 61 44 Q 65 37 69 44" fill="none" stroke="#ca8a04" stroke-width="1.8" stroke-linecap="round" />
          <rect x="60" y="52" width="10" height="4" rx="1" fill="#64748b" />
          <text class="bulb-text" x="65" y="68">A</text>

          
          <g class="glow-dim-right">
            <circle cx="135" cy="42" r="25" fill="url(#glow50)" />
          </g>
          
          <circle cx="135" cy="42" r="12" fill="#fef9c3" stroke="#ca8a04" stroke-width="1.8" />
          <path d="M 131 44 Q 135 37 139 44" fill="none" stroke="#ca8a04" stroke-width="1.8" stroke-linecap="round" />
          <rect x="130" y="52" width="10" height="4" rx="1" fill="#64748b" />
          <text class="bulb-text" x="135" y="68">B</text>
        </svg>
      </div>

      <div class="badge badge-dim">50% Brightness Each</div>
      <div class="shared-note">⚡ Energy shared between 2 bulbs</div>
    </div>
  </div>

</body>
</html>

How Adding More Bulbs Affects Brightness in a Series Circuit

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      width: 100%;
      min-height: 100%;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 12px;
      user-select: none;
    }

    .board {
      display: flex;
      gap: 12px;
      align-items: stretch;
      max-width: 600px;
      margin: 0 auto;
      width: 100%;
    }

    .rows-container {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .row-card {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 14px;
      display: grid;
      grid-template-columns: 70px 1fr 95px;
      align-items: center;
      gap: 8px;
      cursor: pointer;
      transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
    }

    .row-card.active, .row-card:hover {
      border-color: #22b7ff;
      background: #f0f9ff;
    }

    .bulb-count-label {
      font-size: 15px;
      font-weight: 700;
      color: #334155;
    }

    .bulbs-display {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      padding: 4px 0;
    }

    .bulb {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .bulb svg {
      width: 22px;
      height: 22px;
    }

    /* Glow Intensity Tiers */
    .glow-bright {
      background: radial-gradient(circle, #ffffff 15%, #fef08a 50%, #eab308 100%);
      box-shadow: 0 0 22px 8px rgba(234, 179, 8, 0.75);
      border: 2px solid #ca8a04;
    }
    .glow-bright svg { fill: #854d0e; }

    .glow-medium {
      background: radial-gradient(circle, #fffbeb 20%, #fde047 65%, #f59e0b 100%);
      box-shadow: 0 0 11px 3px rgba(245, 158, 11, 0.45);
      border: 2px solid #d97706;
      opacity: 0.9;
    }
    .glow-medium svg { fill: #92400e; }

    .glow-faint {
      background: radial-gradient(circle, #fef3c7 10%, #d97706 75%, #92400e 100%);
      box-shadow: 0 0 5px 1px rgba(217, 119, 6, 0.25);
      border: 2px solid #b45309;
      opacity: 0.75;
    }
    .glow-faint svg { fill: #451a03; }

    .status-col {
      display: flex;
      flex-direction: column;
      align-items: flex-end;
      text-align: right;
      gap: 2px;
    }

    .stars {
      font-size: 13px;
      line-height: 1;
      letter-spacing: -1px;
    }

    .status-text {
      font-size: 13px;
      font-weight: 700;
      white-space: nowrap;
    }

    .status-1 { color: #ca8a04; }
    .status-2 { color: #d97706; }
    .status-3 { color: #b45309; }

    /* Right Trend Indicator */
    .trend-panel {
      width: 58px;
      background: #ffffff;
      border: 2px dashed #cbd5e1;
      border-radius: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 10px 4px;
      text-align: center;
    }

    .trend-tag {
      font-size: 11px;
      font-weight: 800;
      line-height: 1.2;
      color: #64748b;
    }

    .trend-arrow-track {
      flex: 1;
      width: 4px;
      background: linear-gradient(to bottom, #eab308, #ea580c);
      border-radius: 2px;
      margin: 6px 0;
      position: relative;
    }

    .trend-arrow-head {
      position: absolute;
      bottom: -6px;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 0;
      border-left: 6px solid transparent;
      border-right: 6px solid transparent;
      border-top: 8px solid #ea580c;
    }

    @media (max-width: 400px) {
      .row-card {
        grid-template-columns: 54px 1fr 82px;
        padding: 8px 10px;
        gap: 4px;
      }
      .bulb-count-label { font-size: 13px; }
      .bulb { width: 30px; height: 30px; }
      .bulb svg { width: 17px; height: 17px; }
      .status-text { font-size: 11px; }
      .trend-panel { width: 48px; }
      .trend-tag { font-size: 10px; }
    }
  </style>
</head>
<body>

  <div class="board">
    <div class="rows-container">
      
      <div class="row-card active" onclick="highlight(this)">
        <div class="bulb-count-label">1 Bulb</div>
        <div class="bulbs-display">
          <div class="bulb glow-bright">
            <svg viewBox="0 0 24 24"><path d="M12 2a7 7 0 0 0-7 7c0 2.38 1.19 4.47 3 5.74V17a2 2 0 0 0 2 2h4a2 2 0 0 0 2-2v-2.26c1.81-1.27 3-3.36 3-5.74a7 7 0 0 0-7-7zm-2 18a1 1 0 0 0 1 1h2a1 1 0 0 0 1-1v-1h-4v1z"/></svg>
          </div>
        </div>
        <div class="status-col">
          <span class="stars">⭐⭐⭐</span>
          <span class="status-text status-1">Very Bright</span>
        </div>
      </div>

      
      <div class="row-card" onclick="highlight(this)">
        <div class="bulb-count-label">2 Bulbs</div>
        <div class="bulbs-display">
          <div class="bulb glow-medium">
            <svg viewBox="0 0 24 24"><path d="M12 2a7 7 0 0 0-7 7c0 2.38 1.19 4.47 3 5.74V17a2 2 0 0 0 2 2h4a2 2 0 0 0 2-2v-2.26c1.81-1.27 3-3.36 3-5.74a7 7 0 0 0-7-7zm-2 18a1 1 0 0 0 1 1h2a1 1 0 0 0 1-1v-1h-4v1z"/></svg>
          </div>
          <div class="bulb glow-medium">
            <svg viewBox="0 0 24 24"><path d="M12 2a7 7 0 0 0-7 7c0 2.38 1.19 4.47 3 5.74V17a2 2 0 0 0 2 2h4a2 2 0 0 0 2-2v-2.26c1.81-1.27 3-3.36 3-5.74a7 7 0 0 0-7-7zm-2 18a1 1 0 0 0 1 1h2a1 1 0 0 0 1-1v-1h-4v1z"/></svg>
          </div>
        </div>
        <div class="status-col">
          <span class="stars">⭐⭐</span>
          <span class="status-text status-2">Dimmer</span>
        </div>
      </div>

      
      <div class="row-card" onclick="highlight(this)">
        <div class="bulb-count-label">3 Bulbs</div>
        <div class="bulbs-display">
          <div class="bulb glow-faint">
            <svg viewBox="0 0 24 24"><path d="M12 2a7 7 0 0 0-7 7c0 2.38 1.19 4.47 3 5.74V17a2 2 0 0 0 2 2h4a2 2 0 0 0 2-2v-2.26c1.81-1.27 3-3.36 3-5.74a7 7 0 0 0-7-7zm-2 18a1 1 0 0 0 1 1h2a1 1 0 0 0 1-1v-1h-4v1z"/></svg>
          </div>
          <div class="bulb glow-faint">
            <svg viewBox="0 0 24 24"><path d="M12 2a7 7 0 0 0-7 7c0 2.38 1.19 4.47 3 5.74V17a2 2 0 0 0 2 2h4a2 2 0 0 0 2-2v-2.26c1.81-1.27 3-3.36 3-5.74a7 7 0 0 0-7-7zm-2 18a1 1 0 0 0 1 1h2a1 1 0 0 0 1-1v-1h-4v1z"/></svg>
          </div>
          <div class="bulb glow-faint">
            <svg viewBox="0 0 24 24"><path d="M12 2a7 7 0 0 0-7 7c0 2.38 1.19 4.47 3 5.74V17a2 2 0 0 0 2 2h4a2 2 0 0 0 2-2v-2.26c1.81-1.27 3-3.36 3-5.74a7 7 0 0 0-7-7zm-2 18a1 1 0 0 0 1 1h2a1 1 0 0 0 1-1v-1h-4v1z"/></svg>
          </div>
        </div>
        <div class="status-col">
          <span class="stars">⭐</span>
          <span class="status-text status-3">Very Dim</span>
        </div>
      </div>
    </div>

    
    <div class="trend-panel">
      <div class="trend-tag">+ Bulbs</div>
      <div class="trend-arrow-track">
        <div class="trend-arrow-head"></div>
      </div>
      <div class="trend-tag">Less Bright</div>
    </div>
  </div>

  <script>
    function highlight(el) {
      document.querySelectorAll('.row-card').forEach(card => card.classList.remove('active'));
      el.classList.add('active');
    }
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #f8fafc;
      color: #1e293b;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 12px 16px;
      min-height: 100%;
    }
    .toggle-group {
      display: flex;
      gap: 8px;
      background: #e2e8f0;
      padding: 3px;
      border-radius: 20px;
      margin-bottom: 6px;
    }
    .toggle-btn {
      border: none;
      background: transparent;
      padding: 6px 14px;
      border-radius: 16px;
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      color: #64748b;
      transition: all 0.2s ease;
    }
    .toggle-btn.active {
      background: #ffffff;
      color: #0f172a;
      box-shadow: 0 1px 3px rgba(0,0,0,0.12);
    }
    .circuit-container {
      width: 100%;
      max-width: 560px;
      flex-grow: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    svg {
      width: 100%;
      height: auto;
      overflow: visible;
    }
    .wire {
      stroke: #64748b;
      stroke-width: 3.5;
      fill: none;
      stroke-linecap: round;
      stroke-linejoin: round;
    }
    .glow {
      transition: all 0.4s ease;
    }
    .current-dot {
      fill: #38bdf8;
    }
    .status-badge {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 8px 16px;
      border-radius: 10px;
      font-size: 13px;
      font-weight: 600;
      transition: all 0.3s ease;
      margin-top: 4px;
      text-align: center;
    }
    .badge-fact {
      background: #dcfce7;
      color: #166534;
      border: 1px solid #86efac;
    }
    .badge-myth {
      background: #fee2e2;
      color: #991b1b;
      border: 1px solid #fca5a5;
    }
    .bulb-label {
      font-size: 12px;
      font-weight: 600;
      fill: #475569;
      text-anchor: middle;
    }
  </style>
</head>
<body>

  <div class="toggle-group">
    <button class="toggle-btn active" id="btnFact" onclick="setView('fact')">✓ Reality</button>
    <button class="toggle-btn" id="btnMyth" onclick="setView('myth')">✗ Common Myth</button>
  </div>

  <div class="circuit-container">
    <svg viewBox="0 0 540 250">
      <defs>
        
        <radialGradient id="glowFaint">
          <stop offset="0%" stop-color="#facc15" stop-opacity="0.9"/>
          <stop offset="45%" stop-color="#facc15" stop-opacity="0.4"/>
          <stop offset="100%" stop-color="#facc15" stop-opacity="0"/>
        </radialGradient>
        <radialGradient id="glowBright">
          <stop offset="0%" stop-color="#fef08a" stop-opacity="1"/>
          <stop offset="50%" stop-color="#facc15" stop-opacity="0.6"/>
          <stop offset="100%" stop-color="#facc15" stop-opacity="0"/>
        </radialGradient>
        <radialGradient id="glowMedium">
          <stop offset="0%" stop-color="#facc15" stop-opacity="0.75"/>
          <stop offset="50%" stop-color="#facc15" stop-opacity="0.35"/>
          <stop offset="100%" stop-color="#facc15" stop-opacity="0"/>
        </radialGradient>
        <radialGradient id="glowDim">
          <stop offset="0%" stop-color="#facc15" stop-opacity="0.4"/>
          <stop offset="60%" stop-color="#facc15" stop-opacity="0.1"/>
          <stop offset="100%" stop-color="#facc15" stop-opacity="0"/>
        </radialGradient>

        <path id="circuitPath" d="M 70 190 H 470 V 60 H 70 Z" fill="none"/>
      </defs>

      
      <path d="M 235 190 H 70 V 60 H 115" class="wire" />
      <path d="M 165 60 H 245" class="wire" />
      <path d="M 295 60 H 375" class="wire" />
      <path d="M 425 60 H 470 V 190 H 285" class="wire" />

      
      <path d="M 70 190 H 470 V 60 H 70 Z" fill="none" stroke="#38bdf8" stroke-width="2.5" stroke-dasharray="6, 14" stroke-linecap="round" opacity="0.85">
        <animate attributeName="stroke-dashoffset" from="0" to="-80" dur="2.4s" repeatCount="indefinite" />
      </path>

      
      <g transform="translate(140, 60)">
        <circle id="halo1" class="glow" cx="0" cy="0" r="32" fill="url(#glowFaint)" />
        <circle cx="0" cy="0" r="14" fill="#ffffff" stroke="#94a3b8" stroke-width="2"/>
        <path d="M -7 -4 Q 0 -12 7 -4 Q 0 4 -7 -4" fill="none" stroke="#eab308" stroke-width="2"/>
        <text y="28" class="bulb-label">Bulb 1</text>
      </g>

      
      <g transform="translate(270, 60)">
        <circle id="halo2" class="glow" cx="0" cy="0" r="32" fill="url(#glowFaint)" />
        <circle cx="0" cy="0" r="14" fill="#ffffff" stroke="#94a3b8" stroke-width="2"/>
        <path d="M -7 -4 Q 0 -12 7 -4 Q 0 4 -7 -4" fill="none" stroke="#eab308" stroke-width="2"/>
        <text y="28" class="bulb-label">Bulb 2</text>
      </g>

      
      <g transform="translate(400, 60)">
        <circle id="halo3" class="glow" cx="0" cy="0" r="32" fill="url(#glowFaint)" />
        <circle cx="0" cy="0" r="14" fill="#ffffff" stroke="#94a3b8" stroke-width="2"/>
        <path d="M -7 -4 Q 0 -12 7 -4 Q 0 4 -7 -4" fill="none" stroke="#eab308" stroke-width="2"/>
        <text y="28" class="bulb-label">Bulb 3</text>
      </g>

      
      <g transform="translate(260, 190)">
        
        <line x1="-12" y1="-16" x2="-12" y2="16" stroke="#0f172a" stroke-width="3.5" stroke-linecap="round"/>
        <text x="-12" y="-22" font-size="11" font-weight="700" fill="#0f172a" text-anchor="middle">+</text>

        
        <line x1="8" y1="-9" x2="8" y2="9" stroke="#0f172a" stroke-width="5" stroke-linecap="round"/>
        <text x="8" y="-22" font-size="11" font-weight="700" fill="#64748b" text-anchor="middle">−</text>

        <text x="-2" y="32" class="bulb-label">Battery</text>
      </g>

      
      <g fill="#0284c7">
        <polygon points="265,58 275,60 265,62" />
        <polygon points="472,130 470,120 468,130" />
        <polygon points="68,120 70,130 72,120" />
      </g>
    </svg>
  </div>

  <div id="statusBadge" class="status-badge badge-fact">
    <span>✓</span> All 3 bulbs share identical faint brightness
  </div>

  <script>
    function setView(mode) {
      const h1 = document.getElementById('halo1');
      const h2 = document.getElementById('halo2');
      const h3 = document.getElementById('halo3');
      const badge = document.getElementById('statusBadge');
      const btnFact = document.getElementById('btnFact');
      const btnMyth = document.getElementById('btnMyth');

      if (mode === 'fact') {
        btnFact.classList.add('active');
        btnMyth.classList.remove('active');
        
        h1.setAttribute('r', '32');
        h1.setAttribute('fill', 'url(#glowFaint)');
        h2.setAttribute('r', '32');
        h2.setAttribute('fill', 'url(#glowFaint)');
        h3.setAttribute('r', '32');
        h3.setAttribute('fill', 'url(#glowFaint)');

        badge.className = 'status-badge badge-fact';
        badge.innerHTML = '<span>✓</span> All 3 bulbs share identical faint brightness';
      } else {
        btnMyth.classList.add('active');
        btnFact.classList.remove('active');

        h1.setAttribute('r', '44');
        h1.setAttribute('fill', 'url(#glowBright)');
        h2.setAttribute('r', '26');
        h2.setAttribute('fill', 'url(#glowMedium)');
        h3.setAttribute('r', '14');
        h3.setAttribute('fill', 'url(#glowDim)');

        badge.className = 'status-badge badge-myth';
        badge.innerHTML = '<span>✗</span> Myth: Current gets "used up" along the wire';
      }
    }
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      width: 100%;
      height: 100%;
      background: #ffffff;
      font-family: system-ui, -apple-system, sans-serif;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      user-select: none;
      -webkit-user-select: none;
    }
    .circuit-svg {
      width: 100%;
      max-width: 520px;
      height: auto;
      display: block;
    }
    .flow-particles {
      stroke-dasharray: 8 16;
      animation: flowClockwise 1.4s linear infinite;
    }
    @keyframes flowClockwise {
      from { stroke-dashoffset: 48; }
      to { stroke-dashoffset: 0; }
    }
    .glow-pulse {
      animation: pulseGlow 2.5s ease-in-out infinite alternate;
      transform-origin: 390px 175px;
    }
    @keyframes pulseGlow {
      0% { opacity: 0.75; transform: scale(0.96); }
      100% { opacity: 1; transform: scale(1.04); }
    }
    .switch-group {
      cursor: pointer;
    }
    .switch-blade {
      transition: transform 0.3s ease;
      transform-origin: 215px 65px;
    }
    .open .switch-blade {
      transform: rotate(-32deg);
    }
    .open .flow-particles {
      display: none;
    }
    .open .glow-effect,
    .open .rays,
    .open .filament-lit {
      opacity: 0;
      transition: opacity 0.25s ease;
    }
    .open .filament-unlit {
      opacity: 1;
    }
    .filament-lit {
      transition: opacity 0.25s ease;
    }
    .rays, .glow-effect {
      transition: opacity 0.25s ease;
    }
  </style>
</head>
<body>

  <svg class="circuit-svg" viewBox="0 0 520 350" id="circuit">
    <defs>
      
      <radialGradient id="bulbGlow" cx="50%" cy="50%" r="50%">
        <stop offset="0%" stop-color="#fde047" stop-opacity="0.9" />
        <stop offset="45%" stop-color="#facc15" stop-opacity="0.5" />
        <stop offset="75%" stop-color="#eab308" stop-opacity="0.15" />
        <stop offset="100%" stop-color="#eab308" stop-opacity="0" />
      </radialGradient>

      
      <linearGradient id="battGrad" x1="0%" y1="0%" x2="100%" y2="0%">
        <stop offset="0%" stop-color="#0f172a" />
        <stop offset="30%" stop-color="#334155" />
        <stop offset="70%" stop-color="#1e293b" />
        <stop offset="100%" stop-color="#0f172a" />
      </linearGradient>
      
      
      <linearGradient id="goldGrad" x1="0%" y1="0%" x2="100%" y2="0%">
        <stop offset="0%" stop-color="#ca8a04" />
        <stop offset="50%" stop-color="#fde047" />
        <stop offset="100%" stop-color="#a16207" />
      </linearGradient>
    </defs>

    
    <path id="wire" d="M 130,65 L 215,65 M 265,65 L 390,65 L 390,140 M 390,210 L 390,285 L 130,285 L 130,230 M 130,120 L 130,65" 
          fill="none" stroke="#2563eb" stroke-width="5" stroke-linecap="round" stroke-linejoin="round" />

    
    <path class="flow-particles" d="M 130,120 L 130,65 L 215,65 M 265,65 L 390,65 L 390,140 M 390,210 L 390,285 L 130,285 L 130,230" 
          fill="none" stroke="#facc15" stroke-width="4" stroke-linecap="round" />

    
    <g transform="translate(130, 175)">
      
      <rect x="-18" y="-45" width="36" height="90" rx="4" fill="url(#battGrad)" stroke="#0f172a" stroke-width="2" />
      
      <rect x="-18" y="-45" width="36" height="24" rx="3" fill="url(#goldGrad)" />
      
      <rect x="-7" y="-53" width="14" height="8" rx="2" fill="url(#goldGrad)" stroke="#a16207" stroke-width="1" />
      
      
      <text x="0" y="-28" text-anchor="middle" font-size="14" font-weight="900" fill="#0f172a">+</text>
      <text x="0" y="8" text-anchor="middle" font-size="12" font-weight="700" fill="#ffffff" letter-spacing="0.5">1.5V</text>
      <text x="0" y="36" text-anchor="middle" font-size="14" font-weight="900" fill="#94a3b8">−</text>
      
      
      <text x="-28" y="4" text-anchor="end" font-size="13" font-weight="700" fill="#1e2945">Battery</text>
    </g>

    
    <g class="switch-group" id="switchControl" transform="translate(0, 0)">
      
      <circle cx="215" cy="65" r="5.5" fill="#1e2945" />
      <circle cx="265" cy="65" r="5.5" fill="#1e2945" />
      
      <line class="switch-blade" x1="215" y1="65" x2="265" y2="65" stroke="#0f172a" stroke-width="5" stroke-linecap="round" />
      
      <rect x="200" y="35" width="80" height="50" fill="transparent" />
      
      <text id="switchLabel" x="240" y="45" text-anchor="middle" font-size="13" font-weight="700" fill="#1e2945">Switch (Closed)</text>
    </g>

    
    <g transform="translate(390, 175)">
      
      <g class="rays glow-pulse" stroke="#facc15" stroke-width="3" stroke-linecap="round">
        <line x1="0" y1="-42" x2="0" y2="-56" />
        <line x1="30" y1="-30" x2="41" y2="-41" />
        <line x1="42" y1="0" x2="56" y2="0" />
        <line x1="30" y1="30" x2="41" y2="41" />
        <line x1="-30" y1="-30" x2="-41" y2="-41" />
        <line x1="-42" y1="0" x2="-56" y2="0" />
        <line x1="-30" y1="30" x2="-41" y2="41" />
      </g>

      
      <circle class="glow-effect glow-pulse" cx="0" cy="0" r="58" fill="url(#bulbGlow)" />

      
      <circle cx="0" cy="0" r="26" fill="#fefce8" stroke="#eab308" stroke-width="2" />

      
      <path class="filament-lit" d="M -8,12 L -5,-4 L 0,-12 L 5,-4 L 8,12" fill="none" stroke="#f59e0b" stroke-width="2.5" stroke-linejoin="round" />

      
      <path d="M -11,23 L 11,23 L 9,33 L -9,33 Z" fill="#94a3b8" stroke="#475569" stroke-width="1.5" />
      <path d="M -7,33 L 7,33 L 4,37 L -4,37 Z" fill="#475569" />

      
      <g transform="translate(0, 72)">
        <rect x="-85" y="-14" width="170" height="28" rx="14" fill="#fef08a" stroke="#eab308" stroke-width="1.5" />
        <text id="bulbLabel" x="0" y="4" text-anchor="middle" font-size="12.5" font-weight="800" fill="#854d0e">1 Bulb: Full Brightness</text>
      </g>
    </g>

    
    <path d="M 235,285 L 245,280 L 245,290 Z" fill="#2563eb" />
  </svg>

  <script>
    const circuit = document.getElementById('circuit');
    const switchControl = document.getElementById('switchControl');
    const switchLabel = document.getElementById('switchLabel');
    const bulbLabel = document.getElementById('bulbLabel');

    let isClosed = true;

    switchControl.addEventListener('click', () => {
      isClosed = !isClosed;
      if (isClosed) {
        circuit.classList.remove('open');
        switchLabel.textContent = 'Switch (Closed)';
        bulbLabel.textContent = '1 Bulb: Full Brightness';
      } else {
        circuit.classList.add('open');
        switchLabel.textContent = 'Switch (Open)';
        bulbLabel.textContent = 'Circuit Incomplete (Off)';
      }
    });
  </script>
</body>
</html>

science.ks2.y2.t5.s3

Aligned learning resources

Related diagrams