- When an AC source is connected to an ideal inductor show that the average power supplied by the source over a complete cycle is zero.
- A lamp is connected in series with an inductor and an AC source. What happens to the brightness if the lamp when the key is plugged in and an iron rod is inserted inside the inductor? Explain.
CBSE OUTSIDE DELHI - SET 2 CENTRAL 2016
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- $\text{P}_{av} = \text{I}_{av}\text{x }\text{ e}_{av}\cos\phi$
$\therefore\text{P}_{av} = \text{l}_{av} \text{x } \text{ e}_{av}\cos\frac{\pi}{2}$
$\text{P}_{av} = 0 .$
- Brightness decreases:
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