Question

One morning an old man walked bare-foot to replace the fuse wire in kit Kat fitted with 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 cries 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) These days most of the electrical devices we use require a.c. voltage. Why?
iii) Can a transformer be used to step up d.c. voltage?
iv) Write two qualities displayed by Anil by his action.

Answer 1

Fuse degrade over time and collapse at last. An exploded fuse doesn't necessarily mean that the machinery is incorrect. Do not try to replace a fuse if it explodes right after you replace a fuse. In such situations, a trained technician of biomedical devices is named to operate the device. In essence, a fuse is a short wire piece with a chosen diameter and composition that leads to a certain amount of electricity but fuses if the current is above this amount. When it blows, the flow of the current is disrupted and destruction is stopped.

Complete step by step solution:
i) In India, power supply voltage and frequency are 240 V and 50 Hz.
ii) Many electrical devices need a voltage alternating because A.C. is present by necessity in the power supply, and D.C. is only present by batteries so it is in effect a single-way current.
iii) No, hardly any D.C. voltage can be set up by a transformer since a transformer operates with the current and D.C magnetic effects. There is no magnetic field passing voltage.
iv) Anil has two virtues: to stop being the leading man, slipping on the shoes and disconnecting the paws, to keep the old head from behaving as a king of the earth.

Note: Often isolate electrical power from the equipment when cutting a fuse; this does not risk permanent damage. Often replace a fuse by the same type and never replace a foil or other object with a fuse. The electrocution and explosions may be carried on. Hold the fuses used in the clinic or hospital in appropriate amounts. Specify the voltage of the fuse, the amperage or slow-blow-style, the duration, minimum quantity required (minimum reserve level) and the equipment model that utilises each style of fuse in individual containers, and a mark.