Impedance in AC Circuits Video Lessons

Concept

# Problem: In the circuit shown, the light bulb has a resistance R, and the ac emf drives the circuit with a frequency Z. Assuming that the brightness of a bulb is proportional to the power dissipated, which of the following statements is correct?A. The light bulb glows most brightly at very low frequencies.B. The light bulb does not glow at any frequency because AC current cannot flow through the bulb due to the presence of the capacitor.C. The light bulb glows most brightly at very high frequencies.D. The light bulb glows with the same brightness at all frequencies.E. The light bulb glows most brightly at the frequency ω = 1 / √LC

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###### Problem Details

In the circuit shown, the light bulb has a resistance R, and the ac emf drives the circuit with a frequency Z. Assuming that the brightness of a bulb is proportional to the power dissipated, which of the following statements is correct?

A. The light bulb glows most brightly at very low frequencies.

B. The light bulb does not glow at any frequency because AC current cannot flow through the bulb due to the presence of the capacitor.

C. The light bulb glows most brightly at very high frequencies.

D. The light bulb glows with the same brightness at all frequencies.

E. The light bulb glows most brightly at the frequency ω = 1 / √LC