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Water in its most basic state is very good at transferring electricity. It is the impurities in water like dust and salt that make it a good conductor of electricity. For example, if you add salt to water it can become deadly. Pure and deionized water does not conduct electricity. It is called low conductivity water (LCW). It has been used for a long time to cool magnets and other electronic devices.
Since water is a good conductor of electricity it is important to understand how to be safe around water and electricity. Some safety reasons for using electricity near water:
never have normal water touch a power supply.
when dealing with electrical machines in water make sure that they are watertight.
don’t handle power cords or electrical machines with wet hands.
do not go swimming during a lightning storm.