Alternating current cannot be measured by D.C. ammeter because
A.C. annot pass through D.C. ammeter
A.C. changes direction
average value of current for complete cycle is zero
D.C. ammeter will get damaged.
As we learnt in
Equation of I -
- wherein
Angular frequency
= 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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