International Library of Technology · Scranton, International Textbook Co. · leaf 268
y binding-posts a, b at the side of thecase are the terminals of these current coils, and the smallbinding-posts r, ^ on the top connect with the swinging coil.In using wattmeters, care should be taken not to get theconnections mixed, because if the current coil should, bymistake, be connected… … 2642 THEORY OF ALTERNATING be reliable, the self-induction of the swinging coil should bevery small. This is especially necessary if the instrument isto be used on a number of circuits having different frequen-cies. If the self-induction is high, the instrument will notread correctly for any other…
Electrical engineering
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