O-LevelPhysicsElectricity5054/21 · Oct/Nov 2016 · Q76 Marks
The a.c. mains electricity system in a house consists of three wires: the live, the neutral and the earth.
- (a)(i)State the purpose of the live wire.[1]
- (a)(ii)Explain why the neutral wire is needed.[1]
- (b)(i)An electrical appliance is switched on and the current in the fuse becomes greater than the rating of the fuse. State and explain what happens.[2]
- (b)(ii)State and explain in which of the three wires the fuse is located.[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2016). The mark or mark type is shown in brackets.
- [B1] supplies the (mains) e.m.f./voltage
- [B1] to complete the circuit/is at 0 V
- [B1] the circuit/supply is cut/broken or current stops
- [B1] fuse melts/blows/burns
- [B1] live wire
- [B1] when it cuts the circuit/melts no part of the appliance is live/no shock
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