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RLC Circuits and Resonance - Engineering

Q1:

In a certain series resonant circuit, VC = 125 V, VL = 125 V, and VR = 40 V. The value of the source voltage is

A 125 V

B 250 V

C 290 V

D 40 V

ANS:D - 40 V

In Series parallel Resonant circuits, means where circuit response is resonant (that achieve when XL = XC).

So, as per the question statement, the circuit was resonance. this is why VL^2 got canceled with Vc^2 due to the same value.