Use of a.c. voltage is preferred over d.c. voltage on account of the following reasons: (i) An a.c generator is easy to operate and maintain. So we prefer to use a.c. voltage. (ii) Using a Transformer voltage of a.c supply ...
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A material suitablefor making core of a transformer should have (i) a narrow hysteresis curve so as to minimise energy dissipation during each magnetisation cycle and (ii) a high resistivity to lower eddy current losses. Class 12 Physics Chapter 7 ...
Energy loss due to eddy currents and hysteresis loss. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.
The frequency of alternating voltage. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.
To convert a low alternating voltage input into a high alternating voltage output. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.
In order to reduce eddy currents in the transformer. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.
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 ...