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Measuring Resistance

resistance	=	p.d. across component current through component
R	=	V I
ohms	=	volts amps

The current is varied using a variable resistor and measured by placing an ammeter in series with the component.The potential difference is measured with a voltmeter placed in parallel across the component.

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Specification: AQA Physics (7407), AS-level, 3.5.1.1 Basics of electricity. Topic: Electric Current.

Key terms in this lesson

Electromotive force: The electrical energy produced per unit charge by a source, such as a cell, in driving current around a circuit.
Potential difference: The energy transferred per unit charge as charge moves between two points in a circuit.
Resistance: The ratio of the potential difference across a component to the current flowing through it, measured in ohms.
Internal resistance: The resistance within a source of e.m.f., such as a cell, which causes a loss of potential difference, or lost volts, when current flows through it.

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