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

  • A 3.0A
  • B 4.0A
  • C 4.3A
  • D 12.0A
  • E 39.0A
waec 1990physics

The correct answer is B. 4.0A

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

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