. A text-book of electrical engineering;. is induced in it towards the ob-server, and the direction of the current is reversed. Since the polarity ofthe brushes, and the direction of the current in the external circuit are alsoreversed at the same time, the machine gives an alternating current. Thechanges in the current can best be represented by plotting the circumferenceA BCD as abscissae and the electromotive forces induced when the coil-sideis at these various points, as ordinates (Fig. 92). The current at any momentcan be found by dividing the electromotive force at that moment by thetota
. A text-book of electrical engineering;. is induced in it towards the ob-server, and the direction of the current is reversed. Since the polarity ofthe brushes, and the direction of the current in the external circuit are alsoreversed at the same time, the machine gives an alternating current. Thechanges in the current can best be represented by plotting the circumferenceA BCD as abscissae and the electromotive forces induced when the coil-sideis at these various points, as ordinates (Fig. 92). The current at any momentcan be found by dividing the electromotive force at that moment by thetotal resistance of the circuit. It is evident that the machine gives current io8 Electrical Engineering which not only reverses its direction, but which is also intermittent, thatis, it ceases altogether for certain intervals. The transition from the above machine to the modern dynamo is shownin Fig. 93, where the ends of the coil are connected to the two insulatedhalves of a single slip-ring. In Fig. 93 the direction of the current in the.
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