A galvanometer with a coil of resistnace `12.0Omega` shows full scale deflection for a current
Channel: Doubtnut
Date: 2020-08-30

A galvanometer with a coil of resistnace `12.0Omega` shows full scale deflection for a current of 25 mA. How will you convert the meter into:   (i). An ammeter of range 0 to 7.5 A.   (b). A voltmeter of range 0 to 10.0 V   Determine the net resitance of the meter in each case. when an ammeter is put in a circuit, does it read (slightly) less or more than the actual current in the original circuit? when a voltmeter is put across a part of the circuit, does it read (slightly) less or more than the original voltage drop? Explain.