International Library of Technology · Scranton, International Textbook Co. · leaf 260
current. The commonest type ofhot-wire voltmeter is the Cardew, which has been describedin the section on Electrical Measurements. This instrumentwill indicate equally well on either direct or alternatingcurrent, and when it is calibrated with direct current, itwill give the effective E. M. F. if… … Pig. 1496.. voltmeter V in this case measures the drop from e to fthrough the resistance, this drop being equal to CR; hence,if R is known, C can be at once obtained, or the scale of the 2634 THEORY OF ALTERNATING instrument might be so marked as to give the currentdirectly. Hot-wire instruments,…
Electrical engineering
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