1.9 energy and power Flashcards
1
Q
power def
A
the energy transformed or transferred per second
2
Q
power unit
A
watts (W)
3
Q
finish the sentence: the more powerful an appliance is…
A
the faster the rate at which it transfers energy
4
Q
what is 1 watt equal to
A
transferring 1 joule in 1 second (1j/s)
5
Q
power equation
A
energy transferred to appliance (joules)/time taken (seconds)
6
Q
useful power/output power
A
useful energy per second transferred by the device
7
Q
total power/input power
A
energy per second supplied TO the device
8
Q
efficiency equation
A
useful power out/total power in x 100 (a percentage)
