Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 126
edle will only be deflected to the 10-volt division. Instead of connecting the voltmeter to a 10-volt circuit, suppose we connect it in series with 90,000 ohms resistance and to a 100-volt circuit, as in Fig. 121. The total resistance of the voltmeter circuit is 7?^ = 90,000 -(-10,000 = 100,000… … FiG. 120.—A^oltmeter connected to circuit. quently, in Fig. 121, the voltmeter will read 10 volts, the same as on a10-volt circuit. Suppose we did not know the value of Ri, but knew the resistanceof the voltmeter, which in this case we have assiuned tobe R = 10,000 ohms.If when the voltmeter is…
Electric machinery
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