Advertisements
Advertisements
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 ______.
पर्याय
reduction of current
reduction of current and voltage both
power loss is cut down
reduction of current and power loss is cut down both
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
A group of students while coming from the school noticed a box marked "Danger H.T. 2200 V" at a substation in the main street. They did not understand the utility of a such a high voltage, while they argued, the supply was only 220 V. They asked their teacher this question the next day. The teacher thought it to be an important question and therefore explained to the whole class.
Answer the following questions:
(i) What device is used to bring the high voltage down to low voltage of a.c. current and what is the principle of its working ?
(ii) Is it possible to use this device for bringing down the high dc voltage to the low voltage? Explain
(iii) Write the values displayed by the students and the teacher.
Why is the iron core of a transformer made laminated (thin sheets) instead of being in one solid piece?
What is a transformer? On what principle does it work?
Applying e.m. f to primary coil is 210 V. If the number of turns in primary coil is 200 turns and that of in secondary coil is 20 turns, then find out the output voltage. Name the type of transformer.
Describe the construction and working of a transformer with a neat labelled diagram.
State whether true or false. If false, correct the statement.
A transformer can step up direct current.
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?
Define a Transformer.
For what purpose are the transformers used?
