City Guilds Model Questions Vol1 2020 Engineering Question 4

Practice practical question 4 from the 2020 City Guilds Model Questions Vol1 Engineering examination. This question covers Ohm's Law, Series and Parallel Circuits, Electrical Measurements, Power .

City Guilds Model Questions Vol1 2020 Engineering Practical
Topics: Ohm's Law Series and Parallel Circuits Electrical Measurements Power
Question 4 CITY_GUILDS_MODEL_QUESTIONS_VOL1 • 2020 • ENGINEERING • practical

A circuit is assembled on a breadboard as follows: a 12 V DC power supply is connected to a series combination of a 4 Ω resistor (R1) and a parallel network consisting of a 6 Ω resistor (R2) in parallel with a 12 Ω resistor (R3). An ammeter is placed in series with the whole circuit to measure the total current, and a voltmeter is connected across R2 to measure its voltage.

Question Parts

( a )
Draw a clear schematic diagram of the described circuit, indicating the positions of the ammeter and voltmeter.
( b )
Calculate the theoretical total resistance of the circuit.
( c )
If the ammeter reads 1.45 A and the voltmeter across R2 reads 6.8 V, determine:
( ) The actual total resistance of the circuit based on the measured current.
( ) The percentage error between the theoretical and measured total resistance.
( d )
Explain why the voltage across R2 (6.8 V) is not equal to the voltage across R3, and state the voltage across R3.
( e )
If R3 were to fail open (i.e., become an infinite resistance), predict qualitatively how the ammeter reading and the voltmeter reading across R2 would change.

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About This Question

This is City Guilds Model Questions Vol1 2020 Engineering Question 4. It is one of the practical questions from the 2020 City Guilds Model Questions Vol1 Engineering examination.

The question covers Ohm's Law, Series and Parallel Circuits, Electrical Measurements, Power .

View More City Guilds Model Questions Vol1 2020 Engineering Questions More City Guilds Model Questions Vol1 Practice Questions Back to Questions

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