In an AC circuit the quantity that plays the same role as resistance does in a DC circuit is
Correct answer: B. impedance
- A. reactance only
- B. impedance
- C. capacitance
- D. inductance
Explanation
Impedance combines resistance and net reactance and is what relates the rms voltage to the rms current, being measured in ohms. For a series RLC circuit it is the square root of R squared plus the square of the difference of the reactances. Reactance alone accounts for only the capacitive or inductive part.
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About AC Through Resistor, Capacitor and Inductor
Alternating current through a resistor, capacitor and inductor involves phase relationships between voltage and current, reactance, impedance and energy transfer. A resistor keeps voltage and current in phase, while a capacitor and inductor produce opposite phase shifts, a distinction used in circuit diagrams and numerical calculations.
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