Question

The galvanometer from problem 1 (reads from −300Ato +300Awith an internal resistance of 100Ω)is to be used to create an ammeter to read a maximum current of 5A.Sketch the design of the ammeter being used to measure the current through a resistor .

Answer 1

To design an ammeter using a galvanometer to measure a maximum current of 5A, you need to connect it in parallel with a shunt resistance. Use the formula Rs = (Rg / Imax) - Rg to calculate the required shunt resistance.

Step-by-step explanation:

A galvanometer can be used as an ammeter by placing it in parallel with a small resistance, called the shunt resistance. The shunt resistance allows most of the current to pass through it, allowing the ammeter to measure currents greater than those producing a full-scale deflection of the galvanometer.

In this case, to design an ammeter to measure a maximum current of 5A, you would need to connect the galvanometer in parallel with a shunt resistance that can handle the current. The shunt resistance can be calculated using the formula:

Rs = (Rg / Imax) - Rg

Where Rg is the internal resistance of the galvanometer and Imax is the maximum current. Substitute the given values to determine the required shunt resistance.