People have learned to harness many currents to produce power: the power of river currents are controlled by dams, and wind currents are harnessed by wind turbines. Electricity is harnessed by power lines and conductors. Metals like copper and aluminum are good conductors for electricity, and used in lines like those at the Islington Substation in Christchurch, New Zealand, above.

Photograph by Chris McKay, MyShot
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A current is the steady, predictable movement of a fluid within a larger body of that fluid. Fluids are materials capable of flowing and easily changing shape.