PhysicsElectromagnetic inductionJAMB
A step-down transformer changes 240 V to 12 V. If the primary coil has 2000 turns, how many turns has the secondary?
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Answer: C. 100
Ns/Np = Vs/Vp: Ns = 2000 × 12/240 = 100.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.