Arc in a circuit behaves as_______________?
Correct answer: D. a resistance decreasing with voltage rise across the arc
- A. a capackive reactance
- B. an inductive reactance
- C. a resistance increasing with voltage rise across the arc
- D. a resistance decreasing with voltage rise across the arc
Explanation
An arc has a negative resistance characteristic: as the voltage across the arc rises, its effective resistance generally falls because ionisation increases and current rises. This distinguishes it from an ordinary ohmic resistance.
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