First slide

Power in a.c. circuit

Question

If a bulb is connected first with DC and then AC of same voltage, then it will shine brightly

Easy

A

with AC
B

with DC
C

with AC and the brightness in case of AC and DC will be in ratio 1/1.4
D

Equally with both

Solution

Brightness $\propto P_{consumed} \propto \frac{1}{R} .$ For Bulb, $R_{ac} = R_{dc}$ , so brightness will be equal in both the cases.

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