A 60 W heater runs for 1 hour. How much energy is used in kJ?

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Multiple Choice

A 60 W heater runs for 1 hour. How much energy is used in kJ?

Energy used equals power multiplied by time. A 60 W heater delivers 60 joules every second, and 1 hour is 3600 seconds. So energy = 60 × 3600 = 216,000 joules, which is 216 kilojoules (216 kJ). You can also see it with kilowatts and hours: 60 W = 0.06 kW, running for 1 h gives 0.06 kWh, and 1 kWh = 3600 kJ, so 0.06 × 3600 = 216 kJ.

Energy used equals power multiplied by time. A 60 W heater delivers 60 joules every second, and 1 hour is 3600 seconds. So energy = 60 × 3600 = 216,000 joules, which is 216 kilojoules (216 kJ). You can also see it with kilowatts and hours: 60 W = 0.06 kW, running for 1 h gives 0.06 kWh, and 1 kWh = 3600 kJ, so 0.06 × 3600 = 216 kJ.

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