## Formulae and Laws

**Forces and Motion **

Hooke's Law:

You may also have to add atmospheric pressure to get the total pressure.

**Energy and Power **

**Electric Circuits **

for resistors in series

Charge= Voltage*Capacitance

Kirchoff's Laws

1 ^{st } Law: Current into a node equals current out.

2 ^{nd } Law - The voltages sum around a circuit loop add to the supply voltage

**Latent Heat **

Energy to evaporate m kg of liquid=ml, l=Specific Latent Heat of Vapourization

Energy to melt m kg of liquid=ml, l=Specific Latent Heat of Fusion

Energy to heat m kg of a substance by T degrees =mcT, c=Specific Heat Capacity