Question

If the reading of the ammeter, A₁ in the following figure is 2.4 A, what will be the readings of ammeters A₂ and A₃? Neglect the resistances of the ammeters.

Answer 1

Given: i₁ = 2.4 A

Since the 20 Ω and 30 Ω resistors are connected in parallel, the voltage across them will be the same.

From the figure,

\[20 i_1  = 30\left( i - i_1 \right)\]

\[ \Rightarrow 50 i_1  = 30i\]

\[ \Rightarrow i = \frac{50 i_1}{30} = 3 . 99 = 4  A\]

∴ The reading of ammeter A3 = i = 4 A

The reading of ammeter A2 = i - i₁ = 1.6 A