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प्रश्न
What is the function of a step-up transformer?
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उत्तर
We use a step-up transformer to push up or step up the voltage of a given a.c. source.
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संबंधित प्रश्न
State the principle of the step-down transformer and its working.
The teachers of Geeta’s school took the students on a study trip to a power generating station, located nearly 200 km away from the city. The teacher explained that electrical energy is transmitted over such a long distance to their city, in the form of alternating current (ac) raised to a high voltage. At the receiving end in the city, the voltage is reduced to operate the devices. As a result, the power loss is reduced. Geeta listened to the teacher and asked questions about how the ac is converted to a higher or lower voltage.
1) Name the device used to change the alternating voltage to a higher or lower value. State one cause for power dissipation in this device.
2) Explain with an example, how power loss is reduced if the energy is transmitted over long distances as an alternating current rather than a direct current.
3) Write two values each shown by the teachers and Geeta.
How is the e.m.f. across primary and secondary coils of a transformer related with the number of turns of the coil in them?
In an ideal transformer, an output of 66 kV is required when an input voltage of 220 V is available. If the primary has 300 turns, how many turns should the secondary have?
State the principle of a transformer.
Name three losses of energy in a transformer. How are they minimized?
Distinguish between Step up and Step Down Transformer.
Describe the construction and working of a transformer with a neat labelled diagram.
Why is soft iron used in the core?
Which winding is the output coil connected to the load?
