Current
The rate of flow of charge
Conventional Current
Electrons flow from the positive terminal to the negative terminal of a cell
Delocalised electrons
Charge carriers in metals
Voltage
Energy per unit charge
Potential difference
Energy lost per unit charge
Emf (electromotive force)
Energy gained per charge
Resistance
Opposes the flow of charge
Kirchhoff's 1st Law:
The sum of the currents entering any point in a circuit is equal to the sum of the currents leaving that point.
Kirchhoff's 2nd Law:
In any closed loop in a circuit, the sum of the emf in the loop is equal to the sum of potential difference around that loop.