Practice Behavior Of Ac In A Resistor, Inductor, And Capacitor (9.4) - Alternating Current

Practice: Behavior of AC in a Resistor, Inductor, and Capacitor

Lesson 9.4Alternating Current

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9 questions

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4 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is the formula for calculating RMS current through a resistor?
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Think about Ohm’s Law.
Question 2.
In what phase relationship does AC current in a resistor operate?
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Recall the definition of being in phase.
3Question 3.
What formula represents the RMS current in a resistor?
- I_RMS = V_RMS / R
- I_RMS = R / V_RMS
- I_RMS = V_RMS × R
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Consider how voltage, current, and resistance are interrelated.
4Question 4.
True or False: In AC, current lags voltage by 90 degrees in a capacitor.
- True
- False
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Think about the phase differences in AC circuits.
Question 5.
You have a circuit with a resistor (120Ω), an inductor (0.5H), and a capacitor (50μF) all in series. If the AC source operates at 60Hz, calculate the overall impedance and the RMS current supplied by a 240V source.
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Keep in mind to analyze the phase relationships before calculation.
Question 6.
A circuit consists of a 100Ω resistor and a capacitor (C) in series with an AC source of 50Hz. If the current lags the voltage by 45 degrees, determine the required capacitive reactance.
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Sketch the phase angle to visualize.

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