PH-672
Electrical safety
Physics · Secondary 3 · Medium · Electrical safety
A metal‑cased toaster is correctly wired to the mains with a three‑pin plug. The earth wire inside the cable breaks without anyone noticing. Later, the live wire comes loose and touches the metal case. What is the main danger now?
- The fuse will still blow immediately and there is no danger.
- The metal case can become live and give an electric shock to a person touching it.
- The metal case will automatically stay at 0 V, so it is safe to touch.
- The neutral wire will carry all the fault current safely to Earth.
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