The activity uses a steady-state lumped circuit: an ideal voltage source, a switch and a resistive load. Kirchhoff's current continuity means charge does not disappear inside the load, while energy is transferred there. An open switch prevents steady conduction. Transients, internal battery resistance and the filament's temperature-dependent behaviour are omitted.
Light, sound and electricity · Discover & try
What does a bulb need to light?
Reading level 5 of 5 · AdvancedChange
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circuit
A connected route for electric current.
voltage
A potential difference that can drive current.
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See how it works
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Virtual low-voltage DC loop with a fixed resistive load; never a wiring instruction for mains electricity.
What to look for
- The return path matters
- An open switch stops steady current
- Charge continues through the load
Explain what you noticed
Both wires touch a bulb, but one ends before reaching the second battery terminal. What is needed?
Keep this idea: A conducting route must connect through the load and back to the battery.
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Source material checked 2026-10-28. Explanations and activities by Nepedia. Source links do not imply endorsement.
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