efficiency Flashcards
1
Q
why are useful devices useful for
A
transferring energy to one store to another
2
Q
what happens the less energy is wasted
A
the more efficient it is
3
Q
how can you improve the efficiency of energy transfers
A
insulating, lubricating or streamlining objects
4
Q
how do you calculate efficiency
A
useful power output/ total power input
5
Q
what do you need to remember about useful energy output and total energy input
A
no device is 100% efficient and wasted energy is usually transferred into thermal energy stores
electric heaters are the only exception
6
Q
why are electric heaters the only exception
A
all the energy in electrostatic energy is useful
