The quantity that remains constant in a transformer is
Correct answer: D. power
- A. current
- B. voltage
- C. resistance
- D. power
Explanation
The power remains constant. This means that the power input to the primary coil is equal to the power output from the secondary coil, minus any losses due to inefficiency. The formula for power ((P)) is given by (P = VI), where (V) is voltage and (I) is current. So, if the voltage increases during the transformation, the current decreases proportionally, and vice versa, to keep the power constant. This is a consequence of the conservation of energy principle. Pprimary = Psecondary
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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
When carrying electricity on long distances, step-up transformers are used to:
Which of the following remains unchanged in a transformer.
Transformer is used in rectification to _ the supply voltage.
Which of the following transformers converts 220 V into 9 V?
In a transformer, the laminated iron core has reduced the eddy current because the plates in thetransformer are
Consider the following diagram of a working transformer.Which statement is CORRECT about the transformer?I. Input voltage is equal to output voltage.II. Input voltage is less than output voltage.III. Input voltage is greater than output voltage.