Advertisements
Advertisements
प्रश्न
Name the principle on which functioning of a transformer depends.
उत्तर
The functioning of a transformer depends on the phenomenon of electromagnetic induction.
APPEARS IN
संबंधित प्रश्न
Which coil of a step up transformer is made thicker and why?
Explain the significance of Lenz’s law to show the conservation of energy in electromagnetic induction.
The following diagram in Fig.10.42 shows a coil of several turns of copper wire connected to a sensitive centre zero galvanometer G near a magnet NS. The coil is free to move in the direction shown in the diagram.
(i) Describe the observation if the coil is rapidly moved.
(ii) How would the observation be altered if (a) the coil has twice as many turns (b the coil was made to move three times as fast?
For what purpose are the transformers used? Can they be used with a direct current source?
State the principle of a transformer.
Explain the construction of transformer.
Give the advantage of AC in long distance power transmission with an illustration.
Read the following paragraph and answer the question:
Long distance power transmissions
The large-scale transmission and distribution of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped up. It is then transmitted over long distances to an area sub-station near the consumers. There the voltage is stepped down. It is further stepped down at distributing sub-stations and utility poles before a power supply of 240 V reaches our homes.
Which of the following statement is true?
Efficiency of transformer is the ratio of ______.
