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The comparison between Moving Coil & Moving Iron Instruments is given in the table below.
S.No. | Moving Coil Instruments | Moving Iron Instruments |
1. | It works on the principle of DC motor. | It works on the principles of magnetism. |
2. | Deflection torque is proportional to current. | Deflection torque is proportional to the square of the current. |
3. | Damping is provided by the eddy current. | Damping is provided by air damping. |
4. | Spring controlled instruments. | Gravity controlled instruments. |
5. | Controlling torque is proportional to the angle of defection. | Controlling torque is proportional to Sinθ. |
6. | Uniform Scale | Non-Uniform Scale |
7. | Delicate, sensitive and accurate. | Robust, reliable, and accurate |
8. | Costly | Cheap |
9. | Low power consumption | high power consumption than moving coil. |
10. | It is used only in DC Circuits. | It is used both in AC and DC Circuits. |
11. | Can be used as Voltmeter, Ammeter, Galvanometer, ohmmeter | Can be used as Ammeter, Voltmeter, and Wattmeter. |
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