A step down transformer has
Correct answer: B. fewer turns on the secondary than the primary, giving a lower output voltage
- A. more turns on the secondary than the primary
- B. fewer turns on the secondary than the primary, giving a lower output voltage
- C. the same number of turns on both
- D. no core
Explanation
Voltage divides in the ratio of the turns, so fewer secondary turns give a lower voltage, and for an ideal transformer the current rises in the same proportion so that power is conserved. This is what a phone charger does, dropping 220 V to a few volts. A step up transformer reverses the turns ratio.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Transformers
Transformers transfer alternating electrical energy between coils by mutual induction, with voltage ratio determined by the turns ratio. The topic covers step-up and step-down transformers, current changes, ideal power conservation and practical losses such as heating and flux leakage. A transformer requires changing magnetic flux, so it does not operate with steady direct current.
Practise Electromagnetic Induction
288 free Electromagnetic Induction MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Transformers questions
A transformer works on the principle of
A transformer with 1000 primary turns and 100 secondary turns is supplied at 220 V. The secondary voltage is
Electrical power is transmitted over long distances at very high voltage because
The core of a transformer is laminated in order to
An ideal transformer is one in which