By Vladimir Karapetoff
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Extra info for The Electric Circuit
Sample text
Therefore, 130 watts loss can be allowed in the coil. 5 sq. ; the average length of one turn equals 2(22 18) = 80 cm. 8 = 3960 unit conductors, each one meter long and one square millimeter in cross-section. 0328 watt. 37 amp. per sq. mm. This result is independent of the size of the wire, as long as the space factor remains approximately the same. 5 = 6780, and, for a constant space-factor, are also independent of the size above, of the wire. Prob. 5. What are the size of wire and the the voltage drop must not Ans.
Are analogous to the altitudes of certain points, say above the sea level, while the voltages correspond to t their relative elevations. In ences around a closed path Equation (27) is all such cases the sum of the differ- equal to zero. usually written in a somewhat different is form, because the values of e t are usually not known, so that it is desirable to express them through the given electromotive and the resistances of the conductors. The general expression (4) of Ohm's law holds for each conductor in the network.
The angle u in the answers to the preceding problem is expressed in degrees; rewrite the equations so as to have u expressed in Also represent the currents as funcradians, and in fractions of a cycle. tions of the time t. Prob. 9. Express by equations similar to eq. (41) the following sinus. oidal voltages of frequency /: Em (a) Amplitude Em volts, (b) Amplitude ' (c) Amplidegrees with respect to the first curve, tude E m volts, leading the second curve by radians, (d) Amplitude '" m volts, lagging one nth of a cycle with respect to the curve (a).