Equations Paper 1 Flashcards
1
Q
Kinetic energy
A
1/2mv^2
1/2 x mass x velocity^2
2
Q
Gravitational potential energy
A
m g h
3
Q
Power (energy)
A
Work done or energy transferred / time
P= W/t or E/t
4
Q
Efficiency
A
Useful energy, or power output/ total energy, or power input
5
Q
Charge
A
Current x time
Q=IT
6
Q
Potential difference (voltage)
A
Current x resistance
V=IR
7
Q
Power (electricity)
A
Current x potential difference. P=IV
or
Current^2 x resistance. P=I^2R
8
Q
Energy transferred (electricity)
A
Power x time E=Pt
or
Charge x potential difference. E=QV
9
Q
Density
A
Mass/ volume
D=M/V
10
Q
Elastic potential energy
A
1/2ke^2
1/2 x spring constant x extension^2
