Question 119: AC fundamentals

Question

A series LCR circuit of R = 5$$\Omega$$, L = 20 mH and C = 0.5 $$\mu$$F is connected across an AC supply of 250 V, having variable frequency. The power dissipated at resonance condition is ______________ $$	imes$$ 102 W.

Accepted Answer

X
L
= X
C
(due to resonance)
Z = R so $${i_{rms}} = {V \over Z} = {V \over R}$$
$${{{V^2}} \over R} = {{250 	imes 250} \over 5} = 125 	imes {10^2}W$$

AC fundamentals

A series LCR circuit of R = 5$\Omega, L = 20 mH and C = 0.5 \muF is connected across an AC supply of 250 V, having variable frequency. The power dissipated at resonance condition is ______________ \times$ 102 W.

Choose the correct answer: