AC (NCERT)
274610
Alternating current cannot be measured by D.C. ammeter, because
1 A.C. is virtual
2 A.C. changes its direction
3 A.C. cannot pass through D.C. ammeter
4 average value of A.C for complete cycle is zero
Explanation:
(d) Alternating current cannot be measured by D.C. ammeter because average value of A.C. for complete cycle is zero.