chapter 17: electrical circuits

17.1 Potential difference and emf (ESAFA)

When a circuit is connected and also complete, charge can move through the circuit. Charge will not relocate unless there is a reason, a force to journey it round the circuit. Think that it together though fee is at rest and also something has to push it along. This means that work requirements to be excellent to make fee move. A force acts on the charges, doing work, to make them move. The force is noted by the battery in the circuit.

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

Potential distinction

Potential difference is the occupational done per unit charge, (fracWq). The units of potential distinction are the volt (V) i m sorry is characterized as one joule per coulomb.

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

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Voltmeter (ESAFB)

A voltmeter is one instrument for measuring the potential difference between two point out in an electrical circuit.

The symbol for a voltmeter is:


A voltmeter

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When you measure the potential difference throughout (or between) the terminals of a battery that is not in a complete circuit you room measuring the emf of the battery. This is the maximum quantity of work per coulomb of charge the battery have the right to do come drive charge from one terminal, v the circuit, to 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 the potential difference across (or between) the terminals the a battery the is in a complete circuit you are measuring the terminal potential difference of the battery. Return this is measure in volts that is not similar to the emf. The difference will it is in the job-related done to drive charge v the battery.

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One command of the voltmeter is associated to one finish of the battery and the other lead is connected to the contrary end. The voltmeter may also be offered to measure up the voltage across a resistor or any kind of other ingredient of a circuit yet must be linked in parallel.