O-LevelPhysicsElectricity5054/12 · Oct/Nov 2017 · Q321 Mark

The diagram shows the circuit for a hair-dryer. The fan motor has a power rating of 0.10kW and the heaters each have a rating of 0.40 kW. The cost of electricity is 8.0 cents/kWh. What is the cost of running the hair-dryer for two hours with switches P and Q closed and switch R open?

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A1.6 cents

B4.0 cents

C6.4 cents

D8.0 cents

✓ Correct answer

D: 8.0 cents

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2017 Paper 1 Variant 2, question 32.

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