Yes, food dehydrators can use a lot of power, depending on the model and how it is used. Some models use as little as 200 watts, while others use 1,000 watts or more. Dehydrators typically have an adjustable thermostat so that you can control the temperature, and some models also have fans to help circulate the air. The more powerful the dehydrator, the faster it will work, but it will also use more electricity.