Multiple choice

In conventional dams, the power extracted from the water depends on the volume and on the difference in heights of the source and the water's outflow. This difference in heights is referred to as

  1. head

  2. neck

  3. leg

  4. waist
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A Correct answer
Explanation

Most of the hydroelectric power comes from the potential energy of dammed water driving a water turbine and generator. The power extracted from the water depends on the volume and on the difference in heights of the source and the water's outflow. This height difference is called the head. The amount of potential energy in water is proportional to the head.

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