A group of students while coming from the school noticed a        (4 marks)

box marked "Danger H.T. 2200 V" at a substation in the main

street. They did not understand the utility of 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 d.c.

voltage to the low voltage ? Explain.

(iii) Write the values displayed by the students and the teacher.

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