Question

One morning an old man walked bare-foot to

replace the fuse wire in kit kat tted with the

power supply mains for his house. Suddenly he

screamed and collapsed on the oor. His wife

cried loudly for help. His neighbour’s son Anil

heard the cries and rushed to the place with

shoes on. He took a wooden baton and used it

to switch o the main supply.

Answer the following questions:

(i) What is the voltage and frequency of mains

supply in India?

(ii) ese days most of the electrical devices we

use require ac voltage. Why?

(iii) Can a transformer be used to step up dc

voltage?

(iv) Write two qualities displayed by Anil by his

action.

Answer 1

Answer:

Wood is an insulator of electricity. So he was able to help them by using it

Answer 2

Explanation:

QUESTION :-

_________

One morning an old man walked bare-foot to replace the fuse wire in kit kat tted with the power supply mains for his house. Suddenly he screamed and collapsed on the oor. His wife cried loudly for help. His neighbour’s son Anil heard the cries and rushed to the place with shoes on. He took a wooden baton and used it to switch o the main supply.

(i) What is the voltage and frequency of mains supply in India?

(ii) ese days most of the electrical devices we use require ac voltage. Why?

(iii) Can a transformer be used to step up dc voltage?

(iv) Write two qualities displayed by Anil by his action.

ANSWER :-

__________

(i) Voltage of house supply is EV = 220 V and frequency 50 Hz.

(ii) (a) ac is cheap to produce.

(b) Due to step-up and step-down of ac by transformers, the ac can be supplied with less power wastage.

(c) We have electrical elements as capacitors, inductors to control ac with no power loss.

(iii) No, a transformer can’t be used to step up dc voltage.

(iv) Anil has scientific aptitude and is helpful and c aptitude and is helpful and has a good presence of mind.

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@TheStellar♥️