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JAMB Physics 2003 Question 30

Question 30

Current Electricity

In the diagram above, what would happen to the current, I, if another resistor, R2, is connected in parallel to R1?

Diagram for this question
  1. A.It will increase because the equivalent resistance will increase
  2. B.It will decrease if R2 is greater than R1.
  3. C.It will increase because the effective resistance will decrease.
  4. D.It will decrease if R2 is less than R1.
Show the answer and explanation

Answer: C (It will increase because the effective resistance will decrease.)

Explanation

Adding any resistor in parallel lowers the total resistance, so more current flows from the same supply.