Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 120
he voltage coil, but since the lineis open, no current is flowing in the current coil, thei-eforethe instrument will not indicate. This is just as it should be,since wa+ts is the product of volts times amperes. In Fig.11-i no current is flowing in the circuit, therefore the productof volts times… … Fig. 114 Fig. 115 Figs. 114 and 115.—Direct-reading wattmeter connected in circuit. and cause it to move the needle to a given position on thescale. In this case the product of the volts and amperes is125 X 80 = 10,000 watts, or 10 kilowatts. If we mark theposition of the needle on the scale 10, as…
Electric machinery
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