**Coulomb’s Law** – states that the force between two point charges is proportional to the product of the charges and inversely proportional to the square of the distance between them.

**Electric Field Strength (E)** – is the force per unit charge.

**Potential Difference (p.d.)** – between two point is the work done in bringing a charge of one Coulomb from one point to the other.

**Volt** – The potential difference between two points is one volt if one Joule of work is done when bringing a charge of one Coulomb from one point to another.

**The potential at a point** – refers to the work done in bringing unit charge from that point to earth.

**Capacitance** – of a conductor is the ratio of the charge on a conductor to its potential.

**Current** – is a flow of charge.

**1 Amp** = – 1 C / s

**EMF** – voltage when applied to a complete circuit.

**Resistance** – of a conductor is the ratio of the Potential Difference across it to the current flowing through it.

**Ohm’s Law** – the current flowing through a conductor is directly proportional to the Potential Difference across it, assuming constant temperature.

**Resistivity** – (Resistance X Area) / length

**Joules Law** – states that the rate at which heat is produced in a conductor is proportional to the square of the current, provided its resistant is constant