P3.2.8 - Electrical power Flashcards
1
Q
What is power?
A
The rate of transfer of energy or work done in a certain amount of time
2
Q
What is power measured in?
A
Watts (W) ,kilowatts (kW) or megawatts (MW)
3
Q
What is the equation linking power, current and potential difference?
A
Power = current x potential difference
4
Q
What is the equation linking power, current and resistance?
A
Power = (current) squared x resistance
5
Q
What is electrical power?
A
The rate of electrical energy transfer
6
Q
Why does a 10W light bulb appear brighter than a 5W light bulb?
A
The 10W light bulb transfers twice as much electrical energy to light energy per second than the 5W bulb
