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CBSE - XII Science - Physics - Electromagnetic Induction

why cannot current produced by an ac generator be measured with a moving coil ammeter?

Asked by Lekha 27th February 2013, 6:07 AM
Answered by Expert


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.
Answered by Expert 27th February 2013, 11:51 AM

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