A 1000 W kettle runs for 0.5 hours. How much energy does it use in kWh?

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Multiple Choice

A 1000 W kettle runs for 0.5 hours. How much energy does it use in kWh?

Explanation:
Power × time gives energy. The kettle’s power is 1000 W, which is 1 kW. Running for 0.5 hours, the energy used is 1 kW × 0.5 h = 0.5 kWh. (0.05 kWh would need half the time or one-tenth the power; 1 kWh would require 1 hour at 1 kW; 5 kWh would need ten times the energy—e.g., ten times the time or power.)

Power × time gives energy. The kettle’s power is 1000 W, which is 1 kW. Running for 0.5 hours, the energy used is 1 kW × 0.5 h = 0.5 kWh.

(0.05 kWh would need half the time or one-tenth the power; 1 kWh would require 1 hour at 1 kW; 5 kWh would need ten times the energy—e.g., ten times the time or power.)

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