When nuclear power is harnessed it is captured in the form of

Steam that turns a turbine.

Explanation:

A nuclear reactor is a device that produces and controls the release of energy from splitting atoms of uranium. This energy is harnessed in order to boil water to make steam that then drives turbine generators. Nuclear power is a popular alternative to the traditional burning of fossil fuels that remains the primary source of energy in most places all over the world.

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answer; attention;