equations Flashcards
1
Q
kinetic energy
A
Ek = 1/2xmxv^2
kinetic energy=1/2x mass x speed^2
2
Q
gravitational potential energy
A
Ep = m x g x h
g.p.e = mass x g x height
3
Q
power (work done)
A
P = W/t
power = work / time
4
Q
power (energy transferred)
A
P= E/t
power = energy transferred / time
5
Q
efficiency
A
efficiency = useful / supplied
efficiency = useful energy / supplied energy
6
Q
charge flow
A
Q = I x t
charge flow = current x time
7
Q
potential difference
A
V = I x R
potential difference = current x resistance
8
Q
power (current & pd)
A
P = I x V
power = current x potential difference
9
Q
power (current & resistance
A
P = I^2 x R
power = current^2 x resistance
10
Q
energy transferred
A
E = P x t
energy transferred = power x time
11
Q
energy
A
E = Q x V
energy = charge flow x pd
12
Q
density
A
p = m/v
density = mass/volume
