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

Physics
WAEC 1990
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
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Correct Answer: Option B
Explanation
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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