Class 4 (4th Engineer) MET 📅 Nov 2022

Exam Question

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

(b) A Diode half-wave rectifier supplies a resistive load of 100Ω from a 100V AC R.M.S. voltage source. The diode is a resistance of 5Ω during conduction state. (10)

Calculate

(i) The DC output voltage

(ii) DC average load current.

Reference Answer

### (a) Non-Linear Resistors
#### 1. Definition and Comparison
A **Linear Resistor** is an electrical component that strictly obeys Ohm's Law, which states that the current passing through it is directly proportional to the voltage across its terminals, provided the temperature remains constant. Its resistance value is constant. The relationship between voltage (V) and current (I) is represented by a straight line passing through the origin on a V-I graph.
A **Non-Linear Resistor**, in contrast, is a component that does not obey Ohm's Law. Its resistance changes significantly with the applied voltage, current, or operating temperature. Consequently, its V-I characteristic is a curved line, not a straight one.

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