It is proposed to use a non-inductive shunt to increase the range of a 10-A moving iron ammeter to 100 A. The resistance of the instrument, including the leads to the shunt, is 0.06 Ω and the inductance is 15 μH at full scale. If the combination is correct on a.d.c circuit, find the error at full scale on a 50 Hz a.c. circuit.
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Multiplying power of shut
∴ Resistance of shunt
Time constant of shunt and meter should be equal
The current through the meter
With 50 Hz the current through the meter
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