Question

Calculate the resistance in the circuit if the rms voltage is 20V and the rms current is 2A.

(a) 2 ohm

(b) 5 ohm

(c) 10 ohm

(d) 20 ohm

This question was addressed to me in an international level competition.

My question comes from Alternating Current in a Resistive & Inductive Circuit in portion Single Phase Series Circuits of Basic Electrical Engineering

Answer 1

Correct option is (c) 10 ohm

To explain I would say: We know that:

R=V/I

Substituting the given values from the question, we get R=10 ohm.