Post-UTME Physics 2017 Objective — Question 20
Question 20 of 20 from the Post-UTME Screening (Post-UTME) Physics 2017 Objective paper, with the correct answer and a full explanation.
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A step-down transformer is connected to a mains of 240V. If the secondary coil is 10 000 turns, what is the number of turns in the primary coil when the output voltage is 24V?
- A. 100 000Correct
- B. 5760
- C. 1000
- D. 10
Explanation
Np/Ns = Vp/Vs. Np = Ns x Vp/Vs = 10000 x 240/24 = 100000.
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