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प्रश्न
A step-down transformer reduces the supply voltage from 220 V to 11 V and increase the current from 6 A to 100 A. Then its efficiency is
विकल्प
1.2
0.83
0.12
0.9
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उत्तर
0.83
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संबंधित प्रश्न
State the principle on which transformer works.
A transformer converts 240 V AC to 60 V AC. The secondary has 75 turns. The number of turns in primary are _______.
(A) 600
(B) 500
(C) 400
(D) 300
Name two factors on which the magnitude of an induced e.m.f. in the secondary coil depends.
The transformer is used in ______ current circuits.
What is the ideal transformer?
A transformer lowers e.m.f. from 220 V to 15 V. If 400 W power is given in primary, calculate (i) the current in primary coil and (ii) the current in secondary coil.
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.
How do the input and output powers in a transformer compare? State the assumption made.
