Potential difference, also known as voltage, is the difference in electric potential energy between two points in an electric circuit. It is measured in volts (V) and is the driving force that causes electric charges to flow through a circuit.
Potential difference is measured using a voltmeter, which is connected in parallel to the circuit. The voltmeter will display the potential difference in volts.
Potential difference is caused by the presence of an electric field, which can be created by a battery, power source, or other source of electricity. The greater the difference in electric potential between two points, the greater the potential difference.
Potential difference is important in circuits because it is the driving force that allows electricity to flow and power devices. Without a potential difference, there would be no current flow and no electricity.
Electric charges will always move from a point of higher potential energy to a point of lower potential energy, and potential difference determines the direction and rate of this movement. The greater the potential difference, the faster the charges will move through the circuit.