PHYSICS HOMEWORK
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My homework for efficiency in Physics, going to submit this knowt
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13 Terms
What is useful energy?
energy intended on being produced
What is wasted energy?
all other non intended stores of energy
What is the energy input in a fan?
chemical
What is the useful energy out of a fan?
kinetic energy
What is the wasted energy out of a fan?
thermal energy
What is the energy input in a car?
chemical in fuel
What is the useful energy out of a car?
kinetic energy and thermal energy in the inside
What is the wasted energy out of a car?
thermal to surrounding
What is the energy input in a clock
chemical in the battery
What is the useful energy out of a clock?
kinetic energy from clock hands
What is the wasted energy out of a clock?
thermal energy to surroundings
Why are efficient devices better?
better from the environment
doesn’t waste as much thermal energy
doesn’t need as much energy
cheaper
How do you calculate efficiency?
efficiency = useful output energy transfer / total input energy transfer x 100%
Note 
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