Voltage

Voltage is a measure of the difference in electrical energy between two parts of a circuit. The bigger the difference in energy, the bigger the voltage.

Voltage is measured in volts. The symbol for volts is V. For example, 230V is a bigger voltage than 12V.

Measuring voltage

Voltage is measured using a voltmeter. Some types of voltmeter have a pointer on a dial, but most have a digital readout. To measure the voltage across a component in a circuit, you must connect the voltmeter in parallel with it.

Circuit with cell, lamp and  voltmeter. The voltmeter is connected in parallel to the lampCircuit with cell, lamp and voltmeter. The voltmeter is connected in parallel to the lamp

You can measure the voltage across a cell or battery. The more cells, the bigger the voltage.

One circuit has a voltage of 1.5V. A lamp and a voltmeter are connected. The other circuit has a voltage of 4.5V. It has a lamp and a voltmeter connectedTwo circuits with different voltages