In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this. [3 marks]

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Solution

Water used in water hoses contains salts which makes it a good conductor of electricity. (1 mark)
If the electrical supply of the area is not shut off and the firemen spray this water, electricity may pass through the electrical appliances and harm them.
To prevent any such situation, they shut off the electrical supply.
(2 marks)

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In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this.​ [3 marks]

In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this. [3 marks]