Alternating Currents -A Text-Book for Students of by Charles George Lamb

By Charles George Lamb

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Pressures between the needle and the two pairs of quadrants are 41 MEASUREMENT OF POWER V V 9 between one pair and the needle and as shown, being l between the other pair and the needle. -Vf) = k*. N forms a condenser of variable capacity with The needle each of the cross connected pairs of quadrants. If the instrument be made in a perfectly symmetrical manner it is evident that when the needle moves through the angle a from its position of rest, the portions of its area that emerge from within one pair of quadrants and enter into the other pair are exactly equal and Fig.

Impressed on the circuit is a sine one, the current will not be so, and similar considerations In most practical cases, however, will again be brought into play. the sets of vectors are sufficiently nearly in a plane to prevent any serious error being made by neglecting the difference between the OP OP OP OP OP PR PR OR angles X and OR Xj. Theorem on mean values. The following relation is of some considerations and refers to any two periodic Let one of these have the inquantities whatever the form.

Let it be desired to measure the phase angle between the current and pressure in the coil EC (Fig. 29). and in Connect in series with it a non-inductive resistance along which a sliding contact parallel with both a resistance can move. The vector figure of the pressures will then be as given below, being such that AB is the pressure on the series resistance, BC that on the terminal of the coil, and the third AC Let Q be any point on this that between the terminals of R. resistance, then the pressure between B and Q will be given by the line BQ.

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