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Newnes Circuit Calculations Pocket Book
book

Newnes Circuit Calculations Pocket Book

by Thomas J. Davies
April 2016
Intermediate to advanced content levelIntermediate to advanced
384 pages
12h 56m
English
Newnes
Content preview from Newnes Circuit Calculations Pocket Book
3 D.c. circuits
3.1 Current
Chapter
1
introduced d.c. voltages. The voltage between two points
in a circuit is referred to as the potential difference and is the work
done (W) in joules, to move
1
coulomb of charge (Q) between these
points.
In general
W (joules)
V (volts) = -
Q (coulombs)
Transposing the formula gives
W
Q = and W = VQ
V
A voltage produces current in a circuit. The unit of current is the
ampere (A), and the quantity symbol is /. Current is the flow of
electrons, and if a charge of 1 coulomb, which equals 6.241 x 10
18
electrons, passes a given point in 1 second (/) then this constitutes a
current of 1 ampere.
In general
Q (coulombs ...
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Publisher Resources

ISBN: 9781483101132