A moving coil milli ammeter has a resistance of 5 ohm and a full scale deflection of 20mA. Determine the resistance of a shunt to be used so that the instrument could measure current up to 500 mA at 20 degrees. What is the percentage error in the instrument operating at temperature of 40 degrees? Temperature co- efficient of copper = 0.0039 per degrees Celsius above.

A moving coil milli ammeter has a resistance of 5 ohm and a full scale deflection of 20mA. Determine the resistance of a shunt to be used so that the instrument could measure current up to 500 mA at 20 degrees. What is the percentage error in the instrument operating at temperature of 40 degrees? Temperature co- efficient of copper = 0.0039 per degrees Celsius above.

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter32: Two-speed, One-winding (consequent Pole) Motor Controllers

Section: Chapter Questions

Problem 6SQ: Describe the operation of Figure 325 (B) by adding jumper wire A to the original circuit.

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