Exam Question
(a) What are non-linear resistors? (4)
(b) Give three examples of Non-linear resistors with their characteristics. (8)
(c) Give examples of application of non-linear resistors. (4)
Class 4 (4th Engineer)
MET
📅 May 2023
Reference Answer
### (a) Non-Linear Resistors
A non-linear resistor is an electrical component whose resistance is not constant but varies significantly with changes in applied voltage, current, temperature, or incident light intensity. Unlike a linear (or ohmic) resistor, which follows Ohm's Law ($$V = I \times R$$) with a constant resistance `R`, a non-linear resistor has a current-voltage (I-V) characteristic that is not a straight line through the origin.
Key characteristics are:
- **Variable Resistance**: The fundamental property is that its resistance changes in response to an external physical parameter.
A non-linear resistor is an electrical component whose resistance is not constant but varies significantly with changes in applied voltage, current, temperature, or incident light intensity. Unlike a linear (or ohmic) resistor, which follows Ohm's Law ($$V = I \times R$$) with a constant resistance `R`, a non-linear resistor has a current-voltage (I-V) characteristic that is not a straight line through the origin.
Key characteristics are:
- **Variable Resistance**: The fundamental property is that its resistance changes in response to an external physical parameter.
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