An AC voltage source of variable angular frequency ω and fixed amplitude V 0 is connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When ω is increased

Question

An AC voltage source of variable angular frequency ω and fixed amplitude V 0 is connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When ω is increased, The bulb glows dimmer, The bulb glows brighter, Total impedance of the circuit is unchanged, Total impedance of the circuit increases

MARKS App · Accepted Answer

Z = R 2 + X C 2 I r m s = V r m s Z P = I r m s 2 R Where X C = 1 ω C As ω is increased, X C will decrease or Z will decrease . Hence I r m s o r P will increase . Therefore, bulb glows brighter.

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