The current flowing through an ac circuit is given by \(I = 5 \;sin\;(120πt)\;A\). How long will the current take to reach the peak value starting from zero?
- \(\frac{1}{60} s\)
- \(60 \;s\)
- \(\frac{1}{120} s\)
- \(\frac{1}{240}s\)
The Correct Option is D
Solution and Explanation
\(ω = 120π\)
\(⇒T=\frac{1}{60}\;sec\)
The current will take its peak value in \((\frac{T}{4})\) time
\(t=\frac{T}{4}\)
= \(\frac{1}{240}\) \(s\)
Hence, the correct option is (D): \(\frac{1}{240}\) \(s\)
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Concepts Used:
LCR Circuit
An LCR circuit, also known as a resonant circuit, or an RLC circuit, is an electrical circuit consist of an inductor (L), capacitor (C) and resistor (R) connected in series or parallel.
Series LCR circuit
When a constant voltage source is connected across a resistor a current is induced in it. This current has a unique direction and flows from the negative to positive terminal. Magnitude of current remains constant.
Alternating current is the current if the direction of current through this resistor changes periodically. An AC generator or AC dynamo can be used as AC voltage source.
