Current - Moving electric charges, eg electrons moving through a metal wire., Resistance - The opposition in an electrical component to the movement of electrical charge through it. Resistance is measured in ohms., Potential difference - The potential difference (or voltage) of a supply is a measure of the energy given to the charge carriers in a circuit. Units = volts (V). This is the voltage between two points that makes an electric current flow between them., Electrical component - Working parts of a product or system.A device in an electric circuit, such as a battery, switch or lamp., Voltmeter - A device used to measure potential difference or voltage., Ammeter - A device used to measure electric current.,

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