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 54
at the current varies with the pressure, butthat it varies in direct proportion. Ohms law has already been discussed in a pre\dous chapter and the several ways of expressing it are repeated here for con. venience: volts 1. Amperes = ; ohms TESTING AND TESTING APPARATUS 473 2. Volts 3. Ohms amperes… … Fig. 547.—Double contact key. It is of especial value in connection with a Wheatstone bridge.When used with the latter it forms a combination battery and galvanometer key. Thebattery is wired to the top leaves of the key and the galvanometer to the lower leaves.Hence, when operated, the battery…
Electrical engineering
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