## Current

- The flow of electrical charge
*(SI = Ampere, which is 1 coulomb/sec)* - Coulomb is the the SI of electrical charge

## Potential Difference

- The work done per unit charge
- Measured in Volts (V)
- PD of 1V means 1 joule of work is done per coulomb of charge

## Resistance

- The difficulty a charge has flowing across a potential difference
- SI unit = Ohms
**Ohm’s Law: V = IR**

## Impedance

- The opposition that a circuit presents to an electrical current when a voltage is applied

## Inductance

- A property of an electric circuit by which an electromotive force is induced in it by a variation of current either in the circuit itself or in a neighbouring circuit

## Capacitance

- The ability to store charge
**SI = Farad**

## Frequency

- The number of cycles that occur per second measured in Hz

## Amplitude

- The maximum displacement (↑ or ↓) by a point on a wave