- Current is the rate of flow of charge
- Current is not ‘used up’, what flows into an electrical current flows out
- Current is measured in Amps (amperes)
- Current is measured with an ammeter, connected in series
- Potential difference (volts) across electrical components is required to make electrons flow – this is what cells and batteries provide.
- Potential difference is measured in volts
- Potential difference is measured by a voltmeter, connected parallel to the component
It is possible to have voltage but no current, but current cannot flow without potential difference (Voltage)