Physics – 4.2.4 Resistance | e-Consult
4.2.4 Resistance (1 questions)
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Heater Cost:
Energy used = Power * Time = 1 kW * 20 hours = 20 kWh
Cost = Energy used * Price per kWh = 20 kWh * 30 pence/kWh = 600 pence = £6.00
Computer Cost:
Energy used = Power * Time = 0.05 kW * 20 hours = 1 kWh
Cost = Energy used * Price per kWh = 1 kWh * 30 pence/kWh = 30 pence = £0.30
Therefore, the cost of using the heater for 20 hours is £6.00 and the cost of using the computer for 20 hours is £0.30.