A choke is used as a resistance in_________________?
Correct answer: B. AC circuits
- A. DC circuit
- B. AC circuits
- C. Both AC and DC circuit
- D. Full wave rectifier circuit
Explanation
A choke coil has high inductive reactance, XL = 2πfL, in an AC circuit and can limit current with relatively little power loss. In steady DC, f = 0, so its inductive reactance disappears after the switching transient. Students may choose c because a coil has resistance in both cases, but a choke is specifically used as an AC current-limiting device.
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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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