Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 175
RACTICAL APPLIED ELECTRICITY meter or a watt-hour meter by means of a voltmeteran ammeter are shown in Fig. 124. The current in theseries coil of the wattmeter exceeds that in the ammeter byan amount equal to the current in the voltmeter. The truepower, then, should be calculated by adding to the… … Load Fig. 124 current into account is very small, except in the calibra-tion of low reading wattmeters. When a separate source of current and pressure are used,the current taken by the voltmeter produces no error andthe true power is given by the equation W = EXI (98) The indication of the dial on…
Electrical engineering
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