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प्रश्न
The large scale transmission of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped-up because of ______.
विकल्प
reduction of current
reduction of current and voltage both
power loss is cut down
reduction of current and power loss is cut down both
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उत्तर
The large scale transmission of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped-up because of reduction of current and power loss is cut down both.
Explanation:
Because the voltage is increased, the current decreases. Power loss is proportional to the square of the current. Power loss diminishes considerably as current drops.
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संबंधित प्रश्न
Express the turn ratio in terms of voltages.
The primary coil of an ideal step-up transformer has 100 turns and the transformation ratio is also 100. The input voltage and power are 220 V and 1100 W, respectively. Calculate the
(a) number of turns in secondary
(b) current in the primary
(c) a voltage across secondary
(d) current in secondary
(e) power in secondary
Name two kind of energy loss in a transformer. How is it minimized?
The primary and secondary coils of a transformer each have an inductance of 200 x 10-6 H. The mutual inductance between the windings is 4 x 10-6 H. What percentage of the flux from one coil reaches the other?
State the mathematical relation between a number of turns in the primary coil to a secondary coil in the step-up transformer.
Mention the various energy losses in a transformer.
A transformer is essentially an a.c. device. It cannot work on d.c. It changes alternating voltages or currents. It does not affect the frequency of a.c. It is based on the phenomenon of mutual induction. A transformer essentially consists of two coils of insulated copper wire having different numbers of turns and wound on the same soft iron core.
The number of turns in the primary and secondary coils of an ideal transformer is 2000 and 50 respectively. The primary coil is connected to a main supply of 120 V and secondary coil is connected to a bulb of resistance 0.6 Ω.
The value of voltage across the secondary coil is ______.
Define a Transformer.
Derive the equation for a transformer.
