Class 4 (4th Engineer) MET 📅 Oct 2024

Exam Question

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

9 (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

### Part (a): Non-Linear Resistors
A non-linear resistor is an electrical component whose resistance is not constant but varies with the applied voltage or the current flowing through it. Unlike linear resistors, they do not obey Ohm's Law ($$V=IR$$) over a wide range of operating conditions. The relationship between voltage and current is non-proportional, resulting in a curved Voltage-Current (V-I) characteristic graph.
#### Comparison with Linear Resistors
| Feature | Linear Resistor | Non-Linear Resistor |

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