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3.1 Explain how a voltmeter and an ammeter are connected to a circuit - NSC Mechanical Technology Welding and Metalwork - Question 3 - 2017 - Paper 1
Question 3
3.1 Explain how a voltmeter and an ammeter are connected to a circuit. 3.2 State FOUR uses of a multimeter. 3.3 A dry compression test on an internal combustion en... show full transcript
Worked Solution & Example Answer:3.1 Explain how a voltmeter and an ammeter are connected to a circuit - NSC Mechanical Technology Welding and Metalwork - Question 3 - 2017 - Paper 1
Step 1
Explain how a voltmeter and an ammeter are connected to a circuit.
Answer
A voltmeter measures the potential difference between two points in a circuit and is connected in parallel to the circuit components where the voltage is to be measured. In contrast, an ammeter measures the current flowing through a circuit and must be connected in series with the circuit components. This ensures that the current flowing through the ammeter is the same as that flowing through the rest of the circuit.
Step 2
State FOUR uses of a multimeter.
Answer
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Direct Current Measurement (DC): Measures DC voltage, providing readings for battery and circuit analysis.
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Alternating Current Measurement (AC): Measures AC voltage, useful for assessing household electrical systems.
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Resistance Measurement: Tests the resistance of various components and circuits, aiding in troubleshooting.
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Diode Test: Determines the functionality of diodes, indicating whether they are conducting properly.
Step 3
What conclusion can be made regarding these readings?
Answer
The conclusion that can be drawn from the readings is that the piston rings may be worn out in cylinder 1, resulting in a low dry compression reading. The higher pressure observed in the wet compression test suggests that oil is temporarily sealing the gaps due to worn rings, leading to improved compression when fluid is introduced.
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