Question

Discuss the magnitude of relative internal resistances of an ammeter and a voltmeter. Which meter is connected in series? in parallel? Explain.

Answer 1

The internal resistance of ammeter is zero and voltmeter is infinite and, ammeter is connected in series and the voltmeter is in parallel.

To find the answer, we have to study about the internal resistance.

What is the internal resistance of an ammeter and voltmeter?

• A circuit has a parallel connection for the voltmeter and a series connection for the ammeter.
• An ammeter is used to calculate the amount of current flowing through a circuit.
• The value of the potential difference or voltage across the load is measured using a voltmeter (resistor).
• The voltage reading on the voltmeter represents the amount of energy that each unit of charge has transmitted to the component.
• An ideal ammeter should have zero internal resistance since it should permit current to flow through it.
• To measure the current flowing through a circuit, an ammeter is connected in series with the circuit.
• Since the internal resistance of the ideal voltmeter should prevent any current from passing through it, it is infinite.
• Voltmeter measures the potential difference, it is connected in parallel.

Thus, we can conclude that, the internal resistance of ammeter is zero and voltmeter is infinite and, ammeter is connected in series and the voltmeter is in parallel.

Learn more about the internal resistance here:

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