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Grades 11 and 12 - Physics - Senior High School - Costing Electricity
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Grades 11 and 12 - Physics - Senior High School - Costing Electricity
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10 Questions

1. How much energy would be transferred by a computer of power 50 W running for 8 hours?
2. A home owner reads their electricity meter on January 1st and again on the last day of the month. The first value was 4,792 kWh, the second reading was 5,381 kWh. If their electricity cost 12p per unit, what was their January bill?
3. A particular kettle has a power rating of 5 kW. It takes 3 minutes to boil enough water for a cup of tea. How much would it cost if electricity costs 10p per unit?
4. What is the power in watts of an electric drill that transferred 6 kWh of energy in 36 minutes?
5. A consumer was told by an electricity supplier that a unit of electricity costs 10 pence. What exactly is a 'unit'?
6. If an appliance consumes (transfers) electrical energy at a rate of 8 kWh and electricity costs 8 pence per unit. What is the cost of running it for 3 hours?
7. In order to reduce their electricity bill, a home owner changed their electricity supplier who gave them a cheaper rate for any electricity they used between midnight and 6 a.m. This electricity cost only 8p per unit compared to 12p per unit at other times. How much would they have saved if from a total of 589 units 289 had been used at the cheaper price?
8. What does the amount of energy transferred by a television depend on?
9. How many units of electricity would be used by a 2 kW electric fire switched on for 30 minutes?
10. How long could you run a 2 kW hairdryer on 50p if electricity costs 7.5p per unit?

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