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Published in:
The Need for Testing Read chapter Read first chapter

1976 | OriginalPaper | Chapter

Measurement of Power and Energy

Author : A. Simpson, C.Eng., M.I.E.R.E.

Published in: Testing Methods and Reliability — Power

Publisher: Macmillan Education UK

Included in: Professional Book Archive

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For the measurement of power in d.c. circuits a wattmeter is not necessary since power is then the product of ammeter and voltmeter readings. For the a.c. circuit this is only true if the power factor is unity, and for all other conditions a wattmeter is essential since such an instrument indicates true power, that is

supply voltage × current × cosine of phase angle between voltage and current

Metadata
Title
Measurement of Power and Energy
Author
A. Simpson, C.Eng., M.I.E.R.E.
Copyright Year
1976
Publisher
Macmillan Education UK
Book
Testing Methods and Reliability — Power

Print ISBN: 978-1-349-02631-9

Electronic ISBN: 978-1-349-02629-6

Copyright Year: 1976

DOI
https://doi.org/10.1007/978-1-349-02629-6_7

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