Final answer:
Heat is energy exchanged between systems due to temperature differences, measured in joules or calories. Common sources of heat include the sun, fuel combustion, electrical devices, and the human body.
Explanation:
Heat is the exchange of energy between two systems due to a temperature difference. It is measured in joules or calories.
Sources of heat include the sun, combustion of fuels like wood or gas, electrical appliances, and the human body.
Learn more about Heat and sources of heat here:
https://brainly.com/question/43219334
