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A 470 Ω resistor, a 220 Ω resistor, and a 100 Ω resistor are all in parallel. The total resistance is approximately________________?

Correct answer: C. 60 Ω

  • A. 790 Ω
  • B. 470 Ω
  • C. 60 Ω
  • D. 30 Ω

Explanation

For parallel resistors, conductances add: 1/Rt = 1/470 + 1/220 + 1/100, giving Rt ≈ 60 Ω. The equivalent resistance must also be lower than the smallest resistor, 100 Ω.

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