Question

Why cannot the current produced by an A.C. generator be measured with a moving coil ammeter? ....Need Explanation.

Answer 1

Answer:

Explanation:

Because the magnetic field is polarised, the meter needle acts in opposite directions for each direction of current.

A DC ammeter is thus sensitive to which way round it is connected; most are marked with a positive terminal, but some have centre-zero mechanisms and can display currents in either direction.

A moving coil meter indicates the average (mean) of a varying current through it,which is zero for AC. For this reason moving-coil meters are only usable directly for DC, not AC.

HoPe hELpS yu^-^!

Answer 2

In AC generator

as its AC

i =io sinwt

as average value of i = 0

as ammeter for positive and negative moves in opp. direction

As its equal positive and negative current so it will not deflect anywhere

thats why its not used