energy. Energy is the ability to do work or produce power to do work . Energy can neither be created nor be destroyed but it can
change from one from to another. Energy can exist in various forms like
mechanical energy, chemical energy, electrical energy, nuclear energy, thermal
energy etc. Human takes energy from food and do work, an electric motor produce
work by electric energy.
work. If two body are at different temperature than heat is transfer from
higher temperature body to lower temperature body. So temperature is driving
force of heat.
in form of heat is called heat transfer.
heat transfer from a system for given change in its temperature.
Through thermodynamic by using the formula given below we can calculate the amount of heat transferred by the coffee mug to its surroundings.
mug of coffee cool down. So we need heat transfer that tell us about the rate of heat
transfer and we can calculate the time taken by the coffee mug to cool down.