Class 4 (4th Engineer) MET 📅 Mar 2026

Exam Question

(a) Differentiate between resistance, inductance and impedance in an a.c. circuit. (6)

(b) A circuit is made up from four resistors of value 2Ω, 4Ω, 5Ω and 10Ω connected in parallel. If the current is 8.6A, find the voltage drop across the arrangement and the current in each resistor. (10)

Reference Answer

### (a) Differentiate between Resistance, Inductance, and Impedance in an A.C. Circuit.
This question requires a clear distinction between the three fundamental concepts governing current flow in AC circuits. A comprehensive answer must detail their physical basis, mathematical representation, effect on the circuit, and dependence on frequency.
#### 1. Resistance (R)
* **Definition**: Resistance is the opposition to the flow of electric current, present in both DC and AC circuits. It is a fundamental property of a material.

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