Question 402: AC fundamentals

Question

Which graph shows the correct variation of r.m.s. current 'I' with frequency 'f' of a.c. in case of (LCR) parallel resonance circuit?

Accepted Answer

$$\begin{aligned}
& e=e_0 \cos \omega t=10 \cos 2 \pi \mathrm{ft} \
& f=50 \mathrm{~Hz}, \quad t=\frac{1}{600} s \
& \begin{aligned}
	herefore \quad=10 \cos 100 \pi 	imes \frac{1}{600}=10 \cos \frac{\pi}{6} \
\quad=10 \frac{\sqrt{3}}{2}=5 \sqrt{3} V
\end{aligned}
\end{aligned}$$

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AC fundamentals

Which graph shows the correct variation of r.m.s. current 'I' with frequency 'f' of a.c. in case of (LCR) parallel resonance circuit?

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