Post-UTME Physics 2018 Objective — Question 2
Question 2 of 20 from the Post-UTME Screening (Post-UTME) Physics 2018 Objective paper, with the correct answer and a full explanation.
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A battery of e.m.f. 10V and internal resistance 2 ohm is connected to an external resistance of 3 ohm. Determine the potential drop across the 2 ohm (internal) resistance.
- A. 2V
- B. 3V
- C. 4VCorrect
- D. 5V
Explanation
Current I = emf/(R+r) = 10/(3+2) = 2A. Potential drop across internal resistance = I x r = 2 x 2 = 4V.
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