Describe the structure and mode of operation of the repulsion type moving iron meter.

Describe the structure and mode of operation of the repulsion type moving iron meter.

When a current is passed through the coil, the iron rods magnetize in the same poles adjacent to each other in whatever the direction of current. Hence they repel and the pointer move in the same direction until it is stopped by the restoring spring.

Since the magnetic force is proportional to the square of the average current, hence, the deflection is proportional to the square of average current.

Advantage: it measured both direct and alternating current.

Disadvantage: it has nonlinear scale

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