St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 58
t of power. 746 watts make one elec-trical horse-power. Watts = amperes X volts. Fig. 73shows a direcT: reading wattmeter based on the inter-national volt and ampere. They save taking simulta-neous ammeter and voltmeter readings, which are other-wise necessary toget the produdtof volts and… … 56 APPARATUS FOR ELECTRICAL MEASUREMENTS. Fig. 75 shows a voltmeter V, and ammeter A, so placedin the circuit that readings can be taken. D representsa dynamo. A is placed so that the whole current passes through it, while V is placedbetween the main wires tomeasure the difference inpotential. The…
Electricity
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