Physics · Oct / Nov 2017 · Paper 12 · Question 32
The diagram shows the circuit for a hair-dryer. [circuit diagram: fan motor M, switches P, Q, R and two heaters] The fan motor has a power rating of 0.10 kW and the heaters each have a rating of 0.40 kW. The cost of electricity is 8.0 cents / kW h. What is the cost of running the hair-dryer for two hours with switches P and Q closed and switch R open?
- A1.6 cents
- B4.0 cents
- C6.4 cents
- D8.0 cents
As printed in the paper
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Correct answer: D. 8.0 cents
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