alleryStart learning →Which expression gives the impedance of a series LCR circuit?
A√(R² − (XL − XC)²)
B√(R² + (XL + XC)²)
C√(R² + (XL − XC)²)
D√(R² + XL² + XC²)
Answer & Solution
Correct answer: C. √(R² + (XL − XC)²)
The voltages across L and C are opposite in phase, so their phasor sum uses XL − XC at right angles to R.
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