Open Question
Find the emfs ε_1 and ε_2 in the circuit of Fig. E26.26, and find the potential difference of point b relative to point a.
27. Resistors & DC Circuits
Kirchhoff's Junction Rule
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following statements is correct?
A
Ammeters and voltmeters should always be connected to a circuit in parallel with the element being measured.
B
Ammeters and voltmeters should always be connected to a circuit in series with the element being measured.
C
Ammeters should always be connected in parallel with other elements; voltmeters should be connected in series.
D
Ammeters and voltmeters can be wired however you like, without substantially changing the circuit.
E
Ammeters should always be connected in series with other elements; voltmeters should be connected in parallel.
Verified step by step guidance1
Understand the function of an ammeter: An ammeter is used to measure the current flowing through a circuit. To accurately measure the current, it must be connected in series with the circuit element. This ensures that the entire current flows through the ammeter.
Understand the function of a voltmeter: A voltmeter is used to measure the potential difference (voltage) across a circuit element. To measure this correctly, it must be connected in parallel with the element. This allows the voltmeter to measure the voltage drop across the element without altering the current flowing through it.
Consider the impact of incorrect connections: If an ammeter is connected in parallel, it could create a short circuit due to its low internal resistance, potentially damaging the circuit. Conversely, if a voltmeter is connected in series, it would significantly alter the circuit's resistance due to its high internal resistance, affecting the current flow.
Evaluate the given statements: Analyze each statement based on the understanding of how ammeters and voltmeters should be connected. The correct statement should reflect the proper connection methods for both devices.
Identify the correct statement: Based on the analysis, the correct statement is that ammeters should always be connected in series with other elements, and voltmeters should be connected in parallel. This ensures accurate measurements without altering the circuit's behavior.
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