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In an a.c. circuit, the r.m.s. value of current, Iₘₛ is related to the peak current, I₀ by the relation:

1. Iₘₛ = √2 I₀
2. Iₘₛ = π I₀
3. Iₘₛ = 1/π I₀
4. Iₘₛ = 1/√2 I₀

Correct answer: Iₘₛ = 1/√2 I₀

Solution

The r.m.s. value of current in an a.c. circuit is given by Iₘₛ = I₀/√2, where I₀ is the peak current. This is derived from the definition of r.m.s. value for sinusoidal waveforms.

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