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Electric Power

The device th...

Question

The device that decreases the voltage at a substation for its supply, is:

A

Step-up transformer

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B

kWh meter

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C

Step-down transformer

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D

MCB

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Solution

The correct option is C Step-down transformer
A step-down transformer is used to decrease the voltage in electrical power supply. The voltage coming from a higher substation is decreased to a desired level, by passing it through a step-down transformer which consists of two coils wound on two soft iron cores. The primary coil contains more number of coils than the secondary one. A step-up transformer does the opposite job of a step-down transformer.

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Name the device used to (a) increase the voltage at the generating station, and (b) decrease the voltage at the substation for its supply.

Q. Assertion :Transformer is useful for stepping up or stepping down voltages. Reason: Transformer is a device used in D.C. circuits.

Q. A group of students while coming from the school noticed a box marked "Danger H.T.

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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

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. 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.
(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?
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Name the device used to (a)increase the voltage at the generating station ,and (b)decrease the voltage at the sub station for it's supply.

Q. A group of students while coming from 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.
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(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.

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