City Guilds Model Questions Vol1 2024 Engineering Question 4

Practice practical question 4 from the 2024 City Guilds Model Questions Vol1 Engineering examination. This question covers Electrical Principles .

City Guilds Model Questions Vol1 2024 Engineering Practical

Topic: Electrical Principles

Question 4 CITY_GUILDS_MODEL_QUESTIONS_VOL1 • 2024 • ENGINEERING • practical

A copper wire of length 2.00 m and diameter 0.50 mm is connected to a DC power supply. The voltage across the wire and the corresponding current are recorded as follows: | Voltage (V) | 2 | 4 | 6 | 8 | |------------|---|---|---|---| | Current (A) | 0.50 | 1.00 | 1.50 | 2.00 | Using the data, answer the questions below. Assume the temperature of the wire during the measurements is 20 °C and the temperature coefficient of resistivity for copper is 0.004 °C⁻¹.

Question Parts

( a )

Plot the V–I graph on graph paper (straight line through the origin). From the graph, determine the resistance of the wire.

( b )

Using the resistance obtained in part (a), calculate the resistivity (ρ) of the copper wire. Express your answer in scientific notation to two significant figures (Ω·m).

( c )

If the temperature of the wire rises to 50 °C, estimate the new resistance of the wire.

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About This Question

This is City Guilds Model Questions Vol1 2024 Engineering Question 4. It is one of the practical questions from the 2024 City Guilds Model Questions Vol1 Engineering examination.

The question covers Electrical Principles .

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