PH-673
Electrical safety
Physics · Secondary 3 · Hard · Electrical safety
In a table lamp, the switch is accidentally wired into the neutral wire instead of the live wire. The lamp has a metal case that is earthed. Which statement describes the main safety problem when the switch is OFF?
- No current can flow anywhere, so the lamp is completely safe.
- The lamp cannot be switched on, but there is no extra danger.
- The live parts inside the lamp can still be at high voltage even when the lamp is switched off.
- The earth wire will no longer protect the user from electric shock.
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