WAEC - Physics (1990 - No. 39)

Calculate the current in the 3Ω resistor shown in
the diagram above.

3.0A

4.0A

4.3A

12.0A

39.0A

Total Resistance R = 1/R = 1/R₁ + 1/R₂ + 1/R₃
R = 12/13Ω
V = IR = (12/13) x 13 = 12v
1 across 3Ω = V/R = 12/3 = 4A