AC GENERATIONBasic AC TheoryThe induced voltages add in series, making slip ring X (Figure 1) positive (+) and slip ring Y(Figure 1) negative (-). The potential across resistor R will cause a current to flow from Y toX through the resistor. This current will increase until it reaches a maximum value when the coilis horizontal to the magnetic lines of force (Figure 2, 90o). The horizontal coil is movingperpendicular to the field and is cutting the greatest number of magnetic lines of force. As thecoil continues to turn, the voltage and current induced decrease until they reach zero, where thecoil is again in the vertical position (Figure 2, 180o). In the other half revolution, an equalvoltage is produced except that the polarity is reversed (Figure 2, 270o, 360o). The current flowthrough R is now from X to Y (Figure 1).Figure 2 Developing a Sine-Wave VoltageES-07 Page 2 Rev. 0
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