First slide

Phasors and Phasor Diagrams

Question

In an LCR circuit, the potential difference between the terminals of the inductance is 60 V between the terminals of the capacitor is 30V and that between the terminals of resistance is 40V. The supply voltage will be equal to

Easy

A

50 V
B

70 V
C

130 V
D

10 V

Solution

$V = \sqrt{V_{R}^{2} + {(V_{L} - V_{C})}^{2}} = \sqrt{(40)^{2} + (60 - 30)^{2}} = 50 V$

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