question_answer

During the replacing of the fuse wire in the power supply box of his house, Anil was got shocked and collapsed on the floor. After seeing this Anil's friend Ajay ran to him and with the help of a wooden stick switched OFF the main supply.

(i) Write down the qualifies shown by Ajay.

(ii) What is the voltage and frequency of AC supply in India?

(iii) Write down advantages of AC over DC.

Answer:

(i) Ajay is very helpful and has a great presence of mind in such condition.

(ii) In India, frequency of AC supply is 50Hz and its voltage is 220V.

(iii) (a) The AC voltage can be easily stepped up or stepped down by using a transformer, while DC not.

(b) The AC current can be reduced by using a choke coil without any significant loss of energy but DC not.