Electrical Engineering ⇒ Topic : Power curve in pure inductive circuit

Gopal
 
Power curve. Fig. (a) shows the power curve for a pure inductive circuit. During the first 90^{0} of the cycle, the voltage is positive and the current is negative. Therefore, the power supplied is negative. This means the power is flowing from the coil to the source. During the next 90^{0} of the cycle, both voltage and current are positive and the power supplied is positive. Therefore, power flows from the source to the coil. Similarly, for the next 90^{0 }of the cycle, power flows from the coil to the source and during the last 90^{0 }of the cycle, power flows from the source to the coil. An examination of the power curve over one cycle shows that positive power is equal to the negative power. Hence the resultant power over one cycle is zero i.e. a pure inductance consumes no power.The electric power merely flows from the source to the coil and back again.
figure (a)  
 
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