Question

A Light-Dimmer Circuit The intensity of a lightbulb with a resistance of 150 ΩΩ is controlled by connecting it in series with an inductor whose inductance can be varied from L=0L=0 to L=LmaxL=Lmax. This "light dimmer" circuit is connected to an ac generator with a frequency of 60.0 Hz and an rms voltage of 120 V .

A) What is the average power dissipated in the lightbulb when L=0L=0?

Express your answer using two significant figures.

B) The inductor is now adjusted so that L=LmaxL=Lmax. In this case, the average power dissipated in the lightbulb is one-fourth the value found in part A. What is the value of Lmax?

Express your answer using two significant figures.

Answer 1

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