Question

in case of fire, before the fire man use the water hoses, they shut off the main electrical supply for the area .explain why they do this.

Answer 1

water forms a conducting layer for electricity and it can spread even more fire and cause an electric fire ...thus instead of stopping the fire it will cause more of trouble...thus electric supply is stopped

Answer 2

Answer:

Firemen shuts off the main electrical supply for the area because water is a good conductor of electricity and the firemen can get electrocuted.

Hope it helps you dear.