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प्रश्न
Write the function of a transformer.
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उत्तर
A transformer is a device that changes or transforms a low alternating voltage into a high alternating voltage or vice versa.
संबंधित प्रश्न
Derive an expression for ratio of e.m.f.s and currents in terms of number of turns in primary and secondary coil.
Mention various energy losses in transformer device
Complete the following sentence :
……… energy is converted into …………energy by an electric motor.
State two factors on which the magnitude of induced e.m.f. depend.
Distinguish between Step up and Step Down Transformer.
The primary winding of a transformer has 100 turns and its secondary winding has 200 turns. The primary is connected to an a.c supply of 120 V and the current flowing in its is 10 A. The voltage and the current in the secondary are ______.
A transformer consisting of 300 turns in the primary and 150 turns in the secondary gives output power of 2.2 kW. If the current in the secondary coil is 10 A, then the input voltage and current in the primary coil are ______.
Efficiency of transformer is the ratio of ______.
Explain why core of a transformer is always laminated.
