Correct Answer - Option 2 : AC ammeter
AC ammeter uses induction effect.
Concept:
The principle of working of all electrical measuring instruments depends upon various effects of electric current or voltage as shown in the table given below.
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Effect of Electricity
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Type of Instrument
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Suitable for
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Magnetic Effect
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Ammeters, voltmeters, watt meters and energy meters
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D.C. and A.C Current
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Electro dynamic effect
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Ammeters, voltmeters, watt meters
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D.C and A.C Current
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Electromagnetic induction effect
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Ammeters, voltmeters watt meters and energy meters
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A.C Current only
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Thermal effect
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Ammeters, voltmeters
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D.C and AC current
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Chemical Effect
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Ampere-hour meters
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D.C only
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Electrostatic effect
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Volt meters
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D.C and A.C current
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