question_answer 27)

A galvanometer coil has a resistance of and the meter shows full scale deflection for a current of 4 mA. How will you convert the meter into an ammeter of range 0 to 6 A?  

Answer:

Here, galvanometer resistance                                 and                 To convert a galvanometer, a very small resistance S called the shunt resistance is to be connected in parallel with the galvanometer. The value of S is given by