In order to reduce eddy currents in the transformer. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.
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No, because there is no change in magnetic flux in a d.c. circuit. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.
Brightness of the bulb increases on increasing the frequencyof a.c. source because with increase in frequency capacitive reactance Xc and consequently the impedance decreases. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.
Instantaneous power output of an a.c. source can be negative but the average power output can never be negative. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.
(i) Power factor is maximum at 1 when either the a.c. circuit is pure resistive circuit or is in resonance condition. (ii) Power factor is minimum at zero when a.c. circuit is either pure inductive or pure capacitive or a ...