First slide

ammeter

Question

A milliammeter of range 10 mA and resistance $9 Ω$ is joined in a circuit as shown in Fig. The meter gives full-scale deflection for current I when A and B are used as its terminals. If current enters at A and leaves at B (C is left isolated), the value of I is

Moderate

A

100 mA
B

900 mA
C

1 A
D

1.1 A

Solution

$\begin{array}{l} i_{g} = 10 m A = 0.01 A \\ V_{A} - V_{B} = (I - i_{g}) 0.1 = i_{g} (9 + 0.9) \end{array}$
$I = \frac{10 \times 0.01}{0.1} = 1 A$

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