P1.2 Flashcards
1
Q
When energy is transferred, is all of it used?
A
No, only part of it is used, the rest is waste energy
2
Q
What happens to waste energy?
A
It eventually transfers to surroundings which become warmer. It also becomes very spaced out.
3
Q
Give the formula to work out efficiency for energy
A
Efficiency = (useful energy out) x 100
(total energy in)
4
Q
Give the formula to work out efficiency for power
A
Efficiency = (useful power out) x 100
(total power in)
5
Q
if the useful energy out = 100J, and the total energy in = 3000J, what’s the efficiency?
A
3000J divided by 100J = 30J
30J x 100J= 3000J
6
Q
Energy can be transferred usefully stored or dissipated but it can not be what?
A
Created or destroyed
