In case of fire, before the fireman uses the water they shut off the main electrical supply for the area. Explain why they do this?
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Explanation:
Water may conduct electricity. If the electrical supply for the area is not shut and water is over electrical appliances
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Water used in water hoses contains salts making it a good conductor of electricity.
If the electrical supply of the area is not shut off and the firemen sprays this water, electricity may pàss from the electrical appliances and hàrm them.
To prevent any such situation, they shut off the electrical supply.
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