Question

If in an alternating current circuit, resistance is 5 ohm, capacitive reactance is 12 ohm, what is the impedance?

(a) 5 ohm

(b) 10 ohm

(c) 12 ohm

(d) 13 ohm

The question was asked during an interview.

I'm obligated to ask this question of Resistance and Capacitance in Series topic in portion Single Phase Series Circuits of Basic Electrical Engineering

Answer 1

The correct option is (d) 13 ohm

The best explanation: R=5Ω, XC=12Ω

Z^2=R^2+XC^2  Substituting the values we get,

Z^2 = 5^2 + 12^2

Z^2 = 169

Z=13 Ω.