Foundations of Physics by Steve Adams

Author:Steve Adams [Steve Adams]
Language: eng
Format: epub, pdf
ISBN: 978-1-68392-144-8
Publisher: Mercury Learning and Information
Published: 2019-05-14T16:00:00+00:00

The S.I. unit of resistivity is Ω m.

Typical resistivities (at 20°C) for different conductors are shown below:

The resistivity of a length of a resistance wire can be measured using the circuit below:

There is a constant current I in the resistance wire. This is measured using the ammeter.

The moving contact is used to measure the potential difference V for a range of lengths l.

The diameter d of the wire is measured using a micrometer screw gauge. It is best to measure several different diameters at different points on the wire to obtain an average value. The cross-sectional area of the wire is ¼ πd2.

The length of wire l can be measured using a meter ruler.

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