First slide

AC Circuits

Question

In a LCR circuit the pd between the terminals of the inductance is 60 V, between the terminals of the capacitor is 30 V and that between the terminals of resistance is 40 V. the supply voltage will be equal to ……

Moderate

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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