O-LevelPhysicsElectricity5054/22 · Oct/Nov 2020 · Q57 Marks

The cable of a washing machine contains three separate wires. There is a fuse in one of the wires.

(a)Explain how the earth wire and the fuse work together to make the washing machine safer.[3]
(b)(i)State the name of the wire in which the fuse is connected.[1]
(b)(ii)Explain why the fuse is connected into this wire.[1]
(c)The cable of a hair-dryer contains only two wires.
(c)(i)State the name of each of these wires. 1. 2.[1]
(c)(ii)Suggest why the hair-dryer does not need an earth wire.[1]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2020). The mark or mark type is shown in brackets.

[1] (a) if the live / high voltage wire touches the casing/ machine or if the casing /machine becomes live
[1] (a) large current in earth wire or resistance of earth wire small
[1] (a) fuse melts or disconnects supply
[1] (b)(i) live wire
[1] (b)(ii) when the fuse melts the live wire is not connected to any part of the device/is isolated from the mains / supply
[1] (c)(i) live and neutral
[1] (c)(ii) double insulation or it/ casing / hair dryer is plastic

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