Question

The internal resistance of an ammeter is 0.2 $\Omega$. Its full scale deflection current is 10A. The P.d across the terminals when a current of 5A is flowing through it is

• A. 1V
• B. 1.6V
• C. 1.2V
• D. 1.4V

Answer 1

The correct option is A 1V

Given : Internal resistance of ammeter $=0.2\Omega$

To find : Potential difference ($V$) when Current ($I$) $=5A$

The ammeter follows the ohm’s law.

So, $V=IR$ holds true.

$V=$ $\left(5A\right)\times \left(0.2\Omega \right)$ $=1V$