Power Flashcards
1
Q
what is power
A
- the rate of energy transfer
- or the rate of doing work
2
Q
what is the equation for power using its general definiton
A
- P = E / t
- P = W / t
3
Q
what is the equation for work done using pd and charge
A
W = QV
4
Q
what would you do to that equation if you wanted to turn it into an equation which could find the power of electrical energy
A
- divide both sides by t
- to give you W / t = Q / t x V
5
Q
what does that equation now mean
A
- W / t = power
- Q / t = current
- so rewritten the equation is P = IV
- thats where it comes from
6
Q
what is the definition of electrical power in this case then
A
the product of the potential difference across it and the current flowing through it
7
Q
what are the units for electrical power
A
watts (W)
