1.9 energy and power Flashcards
1
Q
What is power?
A
Power is the rate of transfer of energy
2
Q
What is the calculation for the power of an appliance?
A
P = E/T
3
Q
How do you calculate the efficiency of an appliance?
A
Efficiency of an appliance = useful power out / total power in (x 100%)
4
Q
How do you calculate the power wasted by an appliance?
A
Power waste by an appliance = total power input - useful power output
5
Q
What does P stand for?
A
Power (watts, w)
6
Q
What does E stand for?
A
Energy transferred to appliance (joules, j)
7
Q
What does T stand for?
A
Time taken for energy to be transferred (seconds, s)
8
Q
What does the power of an appliance affect?
A
The faster the rate of which it transfers energy
