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TERMINAL OBJECTIVE - h1011v3_19
Figure 2   Developing a Sine-Wave Voltage

Electrical Science Volume 3 of 4
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Basic AC Theory AC GENERATION AC GENERATION An understanding of how an AC generator develops an AC output will help the student analyze the AC power generation process. EO 1.1 DESCRIBE the construction and operation of a simple AC generator. EO 1.2 EXPLAIN the development of a sine-wave output in an AC generator. The elementary AC generator (Figure 1) consists of a conductor, or loop of wire in a magnetic field that is produced by an electromagnet.  The two ends of the loop are connected to slip rings, and they are in contact with two brushes.   When the loop rotates it cuts magnetic lines of force, first in one direction and then the other. Development of a Sine-Wave Output Figure 1   Simple AC Generator At the instant the loop is in the vertical position (Figure 2, 0o), the coil sides are moving parallel to the field and do not cut magnetic lines of force.   In this instant, there is no voltage induced in  the  loop.    As  the  coil  rotates  in  a  counter-clockwise  direction,  the  coil  sides  will  cut  the magnetic lines of force in opposite directions.  The direction of the induced voltages depends on the direction of movement of the coil. Rev. 0 Page 1 ES-07







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