City Guilds Model Questions Vol1 2017 Engineering Question 4

Practice practical question 4 from the 2017 City Guilds Model Questions Vol1 Engineering examination. This question covers Series and parallel circuits, Ohm’s law, Power calculation, Experimental uncertainty .

City Guilds Model Questions Vol1 2017 Engineering Practical

Topics: Series and parallel circuits Ohm’s law Power calculation Experimental uncertainty

Question 4 CITY_GUILDS_MODEL_QUESTIONS_VOL1 • 2017 • ENGINEERING • practical

You are required to investigate the behaviour of a series‑parallel resistive circuit. The circuit consists of three resistors: R1 = 12 Ω, R2 = 18 Ω and R3 = 30 Ω. R1 and R2 are connected in parallel, and this parallel combination is then connected in series with R3 across a 6.00 V DC power supply. Using a digital multimeter, you are to measure the voltage across each resistor and the total current drawn from the supply.

Question Parts

( a )

Draw a clear schematic diagram of the described circuit, labeling all resistors, the power supply and the points where voltage measurements are to be taken.

( b )

Calculate the theoretical equivalent resistance (R_eq) of the whole circuit and the expected total current (I_total) supplied by the 6 V source.

( c )

Using the measured values (recorded in the table below), determine the experimental equivalent resistance and compare it with the theoretical value. State the percentage discrepancy. | Quantity | Measured Value | |------------------------|----------------| | Voltage across R1 (V1) | 2.10 V | | Voltage across R2 (V2) | 2.10 V | | Voltage across R3 (V3) | 3.90 V | | Total current (I) | 0.158 A |

( d )

Discuss two possible sources of error that could affect the voltage and current measurements and propose a practical way to minimise each error.

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About This Question

This is City Guilds Model Questions Vol1 2017 Engineering Question 4. It is one of the practical questions from the 2017 City Guilds Model Questions Vol1 Engineering examination.

The question covers Series and parallel circuits, Ohm’s law, Power calculation, Experimental uncertainty .

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