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Artificial geysers (Water Heaters) work on the Heating Effect of Electric Current.

Such water heater have copper coils. When electric current is passed through it, it heats up a metal plate, which heats up the water.

The heat energy produced can be calculated from the equation:

H = I² R t
where  H = Heat Energy produced
             I = Electric Current passing through coil
             R= Resistance of coil
             t = Time for which current flows.

This equation is called Joule's Law.

Generally, the coil used is of high resistance so as to obtain more heat energy.