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JAMB Physics 1978 Question 26

Question 26

Current Electricity

Two resistors R1 and R2 are connected in parallel, R2 being greater than R1. The combined resistance is

  1. A.less than R1
  2. B.greater than R2
  3. C.the sum of R1 and R2
  4. D.the difference of R2 and R1
  5. E.greater than R1 but less than R2
Show the answer and explanation

Answer: A (less than R1)

Explanation

Adding a resistor in parallel gives the current an extra path, so the combined resistance is always less than the smallest resistor, R1.