An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 203
t does not matter whether the vane is positively chargedand the quadrants negatively charged, or vice versa; an at-traction between the two will always take place and thereforethe instrument can be used equally well on d-c. and a-c. cir-cuits. It should also be remembered that this type draws… … Fig. 109. — Measurement of power supplied to a motor by ammeterand voltmeter. by measuring the current flowing by an ammeter, and thevoltage at the terminals of that portion of the circuit by avoltmeter (Fig. 109). The values of these multiplied togethergive the power in watts. Instruments are made…
Electricity · Magnetism
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