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why are useful devices considered useful?
they transfer energy from one store to another
why are some energy transfers inefficient?
some input energy is wasted, usually as thermal energy
how can you improve efficiency?
by insulating, lubricating, or making objects more streamlined
what is the word equation for efficiency using energy?
efficiency = useful output energy transfer ÷ total input energy transfer
what is the word equation for efficiency using power?
efficiency = useful power output ÷ total power input
can a device be 100% efficient?
no, because some energy is always wasted as thermal energy
what is the exception to devices not being 100% efficient?
electric heaters, because all energy is transferred to useful thermal stores
where does all energy eventually end up?
in thermal energy stores
