03
Two-Bulb Parallel Circuit
Wire two bulbs in parallel so each receives full voltage independently. This is how all household lighting and sockets are wired — one bulb failing or being removed has no effect on the other.
Components Needed
Text Wiring Path
Live → MCB → Switch → Junction Box → Bulb A
→ Bulb B → NeutralSchematic
Steps
- 1Build the single-lamp circuit from Circuit 1.
- 2Add a Junction Box after the Switch.
- 3Place a second Bulb below the first.
- 4Wire the Junction Box output to both bulbs.
- 5Connect both Bulb Neutral ports back to the Neutral terminal.
- 6Press Run — both bulbs light at full brightness.
- 7Disconnect one bulb wire — the other stays on. That's parallel wiring.
Key insight
In a parallel circuit, every branch receives the full supply voltage. Adding more branches increases total current drawn — the MCB protects against overload if too many loads are connected.
⚠ Safety practice
These walkthroughs teach wiring logic in a simulator. Real installation work must be isolated, tested dead, and carried out by a competent person — in the UK, notified under Part P or done by a registered electrician.
Terms used here
Defined in the glossary — each one opens at its own entry.
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