A house uses a 5 kW heater for 2 hours. How much energy is consumed, in kWh?

Study for the IGCSE Physics Electricity Test. Master key concepts with flashcards and multiple choice questions, each providing hints and explanations. Prepare with confidence for your exam!

Multiple Choice

A house uses a 5 kW heater for 2 hours. How much energy is consumed, in kWh?

Explanation:
Energy used equals power multiplied by time. A 5 kW heater running for 2 hours uses 5 kW × 2 h = 10 kWh of energy. This is the standard way to express household energy consumption. If you needed joules, 10 kWh equals 3.6 × 10^7 J, but since the unit asked for is kWh, the final value is 10 kWh.

Energy used equals power multiplied by time. A 5 kW heater running for 2 hours uses 5 kW × 2 h = 10 kWh of energy. This is the standard way to express household energy consumption. If you needed joules, 10 kWh equals 3.6 × 10^7 J, but since the unit asked for is kWh, the final value is 10 kWh.

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