Chapter 2: Efficency Flashcards
1
Q
Energy
A
Joules (J)
2
Q
Power
A
Watts (W)
3
Q
time
A
Seconds (s)
4
Q
Measuring - power, energy and time
A
E
P t
Power = Energy / time Energy = Power x time time = Energy / Power
5
Q
Efficiency
A
Useful energy out / total energy in
No units for efficiency
6
Q
Power
A
Energy / time
E / t
7
Q
Efficiency
Power
A
Useful power out / total power in
8
Q
Efficiency (%)
A
(Useful energy in / total energy out) x 100
