Alternating current cannot be measured by D.C. ammeter because

  • Option 1)

    A.C. annot pass through D.C. ammeter

  • Option 2)

    A.C. changes direction

  • Option 3)

    average value of current for complete cycle is zero

  • Option 4)

    D.C. ammeter will get damaged.

 

Answers (1)

As we learnt in 

Equation of I -

I= I_{0}\sin \omega t= I_{0}\sin 2\: \pi\: \nu\: t

I= I_{0}\sin \frac{2\pi }{T}t

- wherein

\omega= Angular frequency

\nu = Frequency

T =  time period

 

Average value of A.C. for complete cycle is zero. Hence A.C. an not be measured by D.C. ammeter.

 

 

 

 


Option 1)

A.C. annot pass through D.C. ammeter

This is incorrect option

Option 2)

A.C. changes direction

This is incorrect option

Option 3)

average value of current for complete cycle is zero

This is correct option

Option 4)

D.C. ammeter will get damaged.

This is incorrect option

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