Physics · May / June 2019 · Paper 12 · Question 36
The manufacturer of an electrical heater states that only one heater must be connected to the mains wiring through any fuse. The current in the circuit with only one heater is 9 A. The fuse rating is 10 A. Despite the warning, a second identical heater is added, as shown. When the switch is closed the fuse blows. [circuit diagram: to mains circuit, 10 A fuse, two heaters in parallel with switch] The fuse is replaced with a 20 A fuse. What happens when the switch is closed?
- AEach heater only receives half the correct current.
- BEach heater receives twice the correct current.
- CThe circuit wiring connecting the heaters to the mains may overheat.
- DThe fuse melts when the heaters are switched on.
As printed in the paper
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Correct answer: C. The circuit wiring connecting the heaters to the mains may overheat.
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