passwella.
Menu

JAMB Physics 1993 Question 37

Question 37

Current Electricity

The terminal voltage of a battery is 4.0 V when supplying a current of 2.0A, and 2.0V when supplying a current of 3.0A. The internal resistance of the battery is

  1. A.0.5Ω
  2. B.1.0Ω
  3. C.2.0Ω
  4. D.4.0Ω
Show the answer and explanation

Answer: C (2.0Ω)

Explanation

E = V + Ir: E = 4 + 2r and E = 2 + 3r. Subtracting gives r = 2.0 Ω.