A choke is preferred to a resistor for controlling current in an AC circuit because a choke
Correct answer: B. limits the current without dissipating energy as heat
- A. is cheaper
- B. limits the current without dissipating energy as heat
- C. increases the voltage
- D. converts AC to DC
Explanation
An inductor opposes the current through reactance rather than resistance, and because the current and voltage are a quarter cycle out of phase it consumes no net power, returning stored energy to the supply each cycle. A resistor doing the same job would waste that energy as heat. This is why fluorescent tubes are run through a choke rather than a series resistor.
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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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