Why is Water type fire extinguisher not used for electrical or metal fires?

Water type fire extinguishers are not helpful in extinguishing electrical fires as water is a conductor of electric current and thus, the fire will spread. 

Similarly, metal fires are caused by highly reactive metals such as sodium and potassium. These metals react vigorously with water and thus, if any amount of unreacted metal is present it will react violently with water, thus restarting the fire.

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