Post-UTME Physics 2019 Objective — Question 1
Question 1 of 20 from the Post-UTME Screening (Post-UTME) Physics 2019 Objective paper, with the correct answer and a full explanation.
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Circuit diagram: two parallel branches (2 ohm with 2 ohm, and 4 ohm with 4 ohm) in series with a 1 ohm resistor, connected to a 4V battery. In the figure, the current through the 1-ohm resistor is
- A. 4/9 A
- B. 2/3 A
- C. 1 ACorrect
- D. 4 A
Explanation
Two 2-ohm resistors in parallel give 1 ohm; two 4-ohm resistors in parallel give 2 ohm. Total circuit resistance = 1+2+1 = 4 ohm. Current = V/R = 4/4 = 1A, and this full current flows through the series 1-ohm resistor.
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