In a series LCR circuit with applied RMS voltage V and RMS voltages V_R, V_L and V_C across R, L and C, which relation holds?
Correct answer A. V² = V_R² + (V_L − V_C)²
Explanation
V_L and V_C are in antiphase and both are 90° out of phase with V_R. Phasor addition therefore gives V² = V_R² + (V_L − V_C)².
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