31. Alternating Current

Inductors in AC Circuits

Textbook Question
What is the reactance of a 3.00-H inductor at a frequency of 80.0 Hz?
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Multiple Choice
Will a frequency f = 60 Hz or ω = 75 s⁻¹ produce a larger max current in an inductor connected to an AC source?
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Multiple Choice
A certain laptop charger says that the $V_{rms}$ provided to the laptop is 12 V. You know this charger is plugged into an outlet for which $V_{rms}$ is 120 V, such that there must be a transformer inside the laptop charger. If the number of windings of wire on the laptop side of the transformer is 60, how many windings of wire must be on the outlet side of the transformer?
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Multiple Choice
The peak current to and from an inductor is $I_{L}$ when the emf source has a peak voltage $V$ and frequency $f$ . What is the peak current to and from the inductor if the frequency and peak voltage are doubled to $2 f$ and $2 V$ . respectively?
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Multiple Choice
An AC circuit consists of an inductor and an emf source with frequency $0.25 Hz$ . If the source is turned on at $t = 0 s$ , and the first time the voltage across the inductor reaches a maximum value is at $t = 1.4 s$ , when is the first time the current in the inductor is at a maximum?
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Multiple Choice
The peak current to and from an inductor is i when the emf source has a peak voltage V and frequency f. What is the peak current to and from the inductor if the frequency and peak voltage are doubled to 2f and 2V $2 V$ , respectively?
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Textbook Question
What is the inductance of an inductor whose reactance is 120 Ω at 80.0 Hz?
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Textbook Question
An inductor is connected to a 15 kHz oscillator. The peak current is 65 mA when the rms voltage is 6.0 V. What is the value of the inductance L?
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