What is the energy used in 1 hour at a rate of 1,000 watts called?

What is the energy used in 1 hour at a rate of 1,000 watts called?

• A. Kilowatt-hour
• B. Watt-hour
• C. Megawatt-hour
• D. GigaWatt-hour

Answer: (A)

Energy equals power multiplied by time. At 1000 watts, you have 1 kilowatt of power. If that power runs for 1 hour, the energy used is 1 kilowatt-hour. This is the standard unit for electrical energy, and it translates to 3.6 million joules (since 1 kWh = 3,600,000 J). The other units describe different amounts of energy: a watt-hour is the energy from 1 watt for 1 hour (much smaller), a megawatt-hour is the energy from 1 megawatt for 1 hour (1000 kilowatt-hours), and a gigawatt-hour is even larger.

Energy equals power multiplied by time. At 1000 watts, you have 1 kilowatt of power. If that power runs for 1 hour, the energy used is 1 kilowatt-hour. This is the standard unit for electrical energy, and it translates to 3.6 million joules (since 1 kWh = 3,600,000 J). The other units describe different amounts of energy: a watt-hour is the energy from 1 watt for 1 hour (much smaller), a megawatt-hour is the energy from 1 megawatt for 1 hour (1000 kilowatt-hours), and a gigawatt-hour is even larger.