chapter 17: electrical circuits

17.1 Potential difference and emf (ESAFA)

When a circuit is connected and complete, charge can move v the circuit. Charge will certainly not move unless over there is a reason, a force to drive it ring the circuit. Think that it as though charge is at rest and something has to push it along. This way that work requirements to be done to make fee move. A force acts upon the charges, law work, to do them move. The force is detailed by the battery in the circuit.

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A battery has actually the potential to drive fee round a closeup of the door circuit, the battery has potential power that can be converted into electrical energy by doing work-related on the charge in the circuit to do it move.

Potential distinction

Potential distinction is the work-related done per unit charge, (fracWq). The devices of potential difference are the volt (V) which is defined as one joule every coulomb.

Quantity: Potential distinction (V)        Unit name: volt       Unit symbol: V

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Voltmeter (ESAFB)

A voltmeter is an instrument because that measuring the potential difference in between two points in an electric circuit.

The symbol because that a voltmeter is:


A voltmeter

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When you measure the potential difference across (or between) the terminals that a battery that is not in a finish circuit you are measuring the emf the the battery. This is the maximum amount of work per coulomb of fee the battery have the right to do to drive charge from one terminal, through the circuit, come the various other terminal.


The volt is called after the Italian physicist Alessandro Volta (1745–1827).

Electrical potential difference is also called voltage.

When you measure up the potential difference throughout (or between) the terminals of a battery the is in a complete circuit you room measuring the terminal potential distinction of the battery. Return this is measured in volts it is not the same to the emf. The difference will be the work-related done to journey charge through the battery.

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One lead of the voltmeter is connected to one end of the battery and also the other lead is associated to the contrary end. The voltmeter may also be used to measure the voltage throughout a resistor or any other ingredient of a circuit yet must be connected in parallel.