Erschienen in:

1976 | OriginalPaper | Buchkapitel

Measurement of Power and Energy

verfasst von : A. Simpson, C.Eng., M.I.E.R.E.

Erschienen in: Testing Methods and Reliability — Power

Verlag: Macmillan Education UK

Enthalten 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

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Measurement of Power and Energy

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