Capacitor start induction run motors we know about the activity of a capacitor in a pure ac circuit when a capacitor is so introduced the voltage lags the current by some phase angle in these motors the necessary phase difference between the is and im is obtained by introducing a capacitor in series with the starter winding. Circuit theory capacitors from wikibooks open books for an open world with a constant voltage across the capacitor there will be no change in electric charge and thus the steady state current becomes zero stored energy can be discharged from a capacitor by connecting its terminals with a wire. Ac capacitance and capacitive reactance the opposition to current flow through an ac capacitor is called capacitive reactance and which itself is inversely proportional to the supply frequency capacitors store energy on their conductive plates in the form of an electrical charge
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