Question

An ammeter is to be constructed that can read currents up to 2.0 A. If the coil has resistance of 25 Ω and takes 1 mA for full-scale deflection, what should be the resistance of the shunt used?

Answer 1

Explanation:

Let the used shunt’s resistance be R.

The resistance of the coil, g = 25 Ω

Through the coil, the current flows and it is shown as, ig = 1 mA

Through the circuit, the total current i  in which there is a connection of ammeter = 2 A

Since g and R are in parallel connection,

g $\times$ ig = – ig + Ri ⇒ R = igi – ig $\times$ g ⇒R = 10 – 32 – 10 – 3 $\times$ 25 $\times$ 1 ⇒R = 1.25 $\times$ 10-2 Ω

Answer 2

Explanation:

HEY MATE YOUR ANSWER IS HERE ^_^

Let the used shunt’s resistance be R.

The resistance of the coil, g = 25 Ω

Through the coil, the current flows and it is shown as, ig = 1 mA

Through the circuit, the total current i  in which there is a connection of ammeter = 2 A

Since g and R are in parallel connection,

g  ig = – ig + Ri ⇒ R = igi – ig  g ⇒R = 10 – 32 – 10 – 3  25  1 ⇒R = 1.25  10-2 Ω

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