Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 66
AND TESTING APPARATUS 485 Oues. What may be substituted for the voltmeter? Ans. A high resistance galvanometer, whose deflections areproportional to the current, the value of the deflections beingsubstituted in the formula. Oues. What precaution should be taken in makingthe test? Ans. The current… … Fig. 500.—Voltmeter method of testing resistances. Knowing the resistance of the voltmeter,turn switch to the left and from reading calculate resistance corresponding to one divisionof the scale. Turn switch to right and multiply reading by resistance required for deflec-tion of one division This…
Electrical engineering
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