In a step-down transformer, the output current _.
Correct answer: B. Is increased
- A. Is reduced
- B. Is increased
- C. Remains same
- D. None of these
Explanation
A transformer essentially converts between voltage and current using a magnetic field, a step down transformer, steps down the input voltage i.e the secondary voltage is less than the primary voltage .Power can be found by multiplying voltage with current. P= V x IAt primary the equation stands P= Vp x IpAt secondary the equation stands P= Vs x IsSince power remains constant in transformer Pp = PsThe relation becomes Vp/Vs=Ip/IsIn a step down transformer, the secondary voltage becomes less than primary voltage which means voltage decreases and secondary current becomes more than primary current which means current increases. This is to reduce energy loss and keep the power constant.
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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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.
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