First slide

Electrical measuring instruments

Question

A milliammeter of range 10mA and resistance $9 Ω$ is joined in a circuit as shown. The meter gives full scale deflection for current i when A and B are used as its terminals, i.e., current enters at A and leaves at B. Find the value of i (in Amperes)

Moderate

Solution

$i_{g} = 10 mA = 0.01 A$
Since both branches are in parallel , their potential difference is also same.
$(i - i_{g}) 0.1 = i_{g} \times 9.9$
$o r i \times 0.1 = 10 i_{g}$
$o r i = \frac{10 \times 0.01}{0.1} = 1 A$
Therefore, the correct answer is 1.00

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