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Question
What is a transformer? On what principle does it work?
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Solution
A transformer is device by which the amplitude of an alternating e.m.f. can be increased or decreased.
RELATED QUESTIONS
Draw a labeled diagram of a step-down transformer.
Which coil of a step up transformer is made thicker and why?
The following diagram in Fig. 10.44 shows a coil X connected to a sensitive centre –zero galvanometer G and a coil P connected to a battery through a switch S.
(a) Describe the observation when the switch S is (i) closed suddenly, (ii) then kept closed, (iii) finally opened.
(b) Name and state the law which explains the above observations.
The secondary windings of a transformer in which the voltage is stepped down are usually made of thicker wire than the primary. Explain why.
Why is the iron core of a transformer made laminated (thin sheets) instead of being in one solid piece?
Mention the two characteristic properties of the material suitable for making core of a transformer.
Draw a labelled diagram to show the various parts of a step-up transformer and step down transformer.
Name one electrical device which works on Faraday's law of electromagnetic induction principle.
Electrical energy is transmitted over large distances at high alternating voltages. Which of the following statements is (are) correct?
- For a given power level, there is a lower current.
- Lower current implies less power loss.
- Transmission lines can be made thinner.
- It is easy to reduce the voltage at the receiving end using step-down transformers.
For what purpose are the transformers used?
