Question

How will you convert 1mA full scale deflection galvanometer of resistance 100ohm into an ammeter to read 1A full scale deflection and into a voltmeter to read 1volt full scale deflection

Answer 1

Explanation:

When the galvanometer is at full scale, the voltage across it is V = I × R = 1ma × 100 ohms = 100mV. If we want to set full scale to be 1A, we have to shunt the meter with a resistor to take 999mA while the meter takes 1mA so the total is the 1A. The resistor needed will have 100mV across it and 999mA through it.