Equations Flashcards
1
Q
Kinetic energy stored
A
Ek=1/2mv2
2
Q
GPE stored
A
Mg x change in height
3
Q
Elastic potential energy stored
A
Ee=1/2ke2
4
Q
Work done(energy transferred)
A
Force x distance
5
Q
Electrical work
A
Potential difference x current x time
V x I x T
6
Q
Power
A
Work done/time
7
Q
Efficiency(power in watts)
A
Useful power output/total power input x 100
8
Q
Efficiency(energy in joules)
A
Useful energy output/total energy input x 100
9
Q
Current
A
Charge/time
I=Q/t
10
Q
Potential difference (V)
A
Work/Charge
W/Q
11
Q
Potential difference(Ohm’s law)
A
Current x Resistance
I x R
12
Q
Resistance in parallel circuits
A
1/R1 + 1/R2
13
Q
Wave speed
A
Frequency x wavelength
14
Q
Pressure(solids)
Remember measured in N/cm2
A
Force/area
F/a
15
Q
Pressure (liquids)
A
Density(p) x Gravitational field strength (g) x height
