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Foundations of Wireless and Electronics, 10th Edition
book

Foundations of Wireless and Electronics, 10th Edition

by M. G. Scroggie, S. W. Amos
October 2013
Intermediate to advanced content levelIntermediate to advanced
570 pages
27h 46m
English
Newnes
Content preview from Foundations of Wireless and Electronics, 10th Edition
73
Generalising this calculation, we find that when an alternating
voltage is adjusted to deliver the same power to a given resistance as a
direct voltage, its peak value is ^2 times the direct voltage, or about
1.414 times as great. Put the other way round, its nominal or
equivalent or effective voltage—called its r.m.s. (root-mean-square)
value—is 1/^2 or about 0.707 times its peak value. Since the
resistance is the same in both cases, the same ratio exists between
r.m.s.
and peak values of the current. What is called a 240-V a.c.
supply therefore alternates between + and
^2 χ 240 = 339 V peak.
Since the r.m.s. values of voltage and curren ...
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Publisher Resources

ISBN: 9781483105574