Current is measured in Amps (A) using an Ammeter
Voltage is measured in Volts (V) using a Voltmeter
Voltage = Current x Resistance
The resistance in a circuit can be increased by adding more components, such as resistors and lamps.
The diagram below shows the standard circuit symbols you need to know.
Two things are important for a circuit to work:
- there must be a complete circuit
- there must be no short circuits
A current flows when an electric charge moves around a circuit. No current can flow if the circuit is broken, for example, when a switch is open…