Choose the correct statements in reference to ammeters and voltmeters.
I. Ammeter is connected in series with the resistor. II Voltmeter is connected in series with the resistor. III Voltmeter has a huge resistance.
A
I only
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B
II only
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C
I and II only
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D
II and III only
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E
I and III only
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Solution
The correct option is E I and III only Ammeter measures the current passing thought it. It is connected in series with the resistor since the current in objects connected in series is the same.
Voltmeter measures the potential difference across its ends. Thus it is connected end to end with the resistor to be found potential difference across, that is, connected in parallel. Since it is connected in parallel, it is required to have a huge resistance such that no current passes through it lessening through the resistor.