Class 4 (4th Engineer) MET 📅 Aug 2024

Exam Question

(a) State the relationship between impedence, voltage and current. (6)

(b) The filament of a 230V lamp takes a current of 0.261A when working at its normal temperature of 2000° C. The temperature coefficient of the tungsten filament material can be taken as 0.005° C^-1 at 0° C. Find the approximate current which flows at the instant of switching on the supply to the cold lamp, which can be considered to be at a room temperature of 20° C. (10)

Reference Answer

### Part (a): Relationship between Impedance, Voltage, and Current (6 Marks)
The relationship between impedance (Z), voltage (V), and current (I) in an Alternating Current (AC) circuit is defined by Ohm's Law for AC circuits. This relationship is fundamental to understanding AC circuit analysis.
1. **Fundamental Equation**: The relationship is expressed by the formula:
$$ V = I \times Z $$

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