Class 4 (4th Engineer) MET 📅 Nov 2025

Exam Question

(a) Explain about non-linear resistors with some examples and illustration on how they differ from linear resistor. (6)

(b) A half-wave rectifier is used to supply 50V d.c. to a resistive load of 800 Ω. The diode has a resistance of 25 Ω. Calculate a c. voltage required. (10)

Reference Answer

### (a) Non-linear Resistors
#### 1. Introduction
A non-linear resistor is a passive electrical component whose resistance is not constant but varies with the applied voltage, current, or other physical parameters like temperature or light intensity. Unlike a linear resistor, it does not obey Ohm's Law (V = IR with a constant R) over its entire operating range. The relationship between voltage and current is non-linear, resulting in a curved Voltage-Current (V-I) characteristic graph.
#### 2. Linear vs. Non-linear Resistors

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