The correct answer is A. 1 kW = 1000 W.
A kilowatt (kW) is a unit of power equal to 1000 watts. It is used to measure the rate at which energy is used or converted. For example, a 1 kW heater will use 1000 watts of power to heat up a room.
A watt (W) is a unit of power equal to one joule per second. It is used to measure the rate at which work is done or energy is used. For example, a 1 W light bulb will use 1 joule of energy every second to produce light.
The other options are incorrect because they do not represent the correct value of 1 kW. Option B, 10 W, is 10 times smaller than the correct value. Option C, 100 W, is 100 times smaller than the correct value. Option D, 10000 W, is 1000 times larger than the correct value.