A voltmeter of resistance 1000 Ω gives full scale deflection when a current of 100 mA flows through it. The shunt resistance required across it to enable it to be used as an ammeter reading 1 A at full scale deflection is

Question

A voltmeter of resistance 1000 Ω gives full scale deflection when a current of 100 mA flows through it. The shunt resistance required across it to enable it to be used as an ammeter reading 1 A at full scale deflection is (A)  10000 Ω  (B)  9000 Ω  (C)  222 Ω  (D)  111 Ω

Tardigrade Admin · Accepted Answer

By using (i/ig)=1+(1000/S) (i/100× 10-3)=1+(1000/S) ⇒ S=(1000/9) =111 Ω

Q. A voltmeter of resistance $1000 Ω$ gives full scale deflection when a current of $100 m A$ flows through it. The shunt resistance required across it to enable it to be used as an ammeter reading $1 A$ at full scale deflection is

$10000 Ω$

$9000 Ω$

$222 Ω$

$111 Ω$

By using $\frac{i}{i _{g}} = 1 + \frac{1000}{S}$
$\frac{i}{100 \times 1 0 ^{- 3}} = 1 + \frac{1000}{S}$
$\Rightarrow S = \frac{1000}{9}$
$= 111 Ω$

Q. A voltmeter of resistance 1000Ω gives full scale deflection when a current of 100mA flows through it. The shunt resistance required across it to enable it to be used as an ammeter reading 1A at full scale deflection is

10000Ω

9000Ω

222Ω

111Ω