At series resonance, how does the voltage across the inductor (L) compare to the capacitor (C) voltage____________voltage across C?
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Answer: A. Equal to but opposite in phase to
Explanation
At series resonance, inductive reactance and capacitive reactance cancel each other out because their magnitudes are equal. Current flowing through the series circuit creates voltages across the inductor and capacitor that are equal in magnitude. Since inductive voltage leads current by ninety degrees while capacitive voltage lags by ninety degrees, they are opposite in phase. Series resonance occurs when the supply frequency makes inductive reactance equal to capacitive reactance. The total impedance of a series LC circuit reaches its absolute minimum, consisting solely of circuit resistance. Although terminal voltages across L and C cancel out externally, high reactive voltages can still exist internally.
Option B incorrectly states that the voltages are in phase when they actually have a one hundred eighty degree phase opposition. Option C is wrong because the reactive voltages are equal in magnitude rather than one being greater than the other. Option D is incorrect as the capacitor and inductor voltages are equal and opposite in phase at series resonance.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
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