One morning an old man walked bare-foot to replacce the fuse wire in kit kat fitted with the power supply mains for his house. Suddenly he screamed and collapsed on the floor. His wife cried loudly for help. His neighbour's son Anil heard the crises and rushed to the place with shoes on. He took a wooden baton and used it to switch off the main supply .
Answer the following questions.
(i) what is the voltage and frequency of mains supply in India ?
(ii) Can a transformer be used to step up d.c. voltage ?
(iii) write two qualities displayed by Anil by his action.

Explanation

(i) Voltage = 220 V
Frequency = 50 Hz.
(ii) (a) AC current is much easier to produce.
(b) The cost of DC to AC is reltively high.
© The direction of the current flow is reversed. Due to this property, we can jerk, and avoid from supply to step up.
(iii) No, reason-This is only possible if the primary current is also changing . Hence the transforme on a.c. supply to step up.
(iv) (i) He switched off the main supply which means, he stopped to flow of current from further electric shocks.
(v) (a) He saved the precious life of human.
(b) , He used safety rules to protect an old man.