Hydroelectric dams are often used to generate electrical energy. The energy of the water
flowing over the dam is harnessed and
transformed into electrical energy that can
power appliances and other tools. What type of
energy is transformed into electrical energy by
hydroelectric dams?

Potential & Kinetic energy.

Explanation:

The water used gains potential energy overtime before it is converted to mechanical (or kinetic energy). This can be explained by the water having increased potential energy as it flows at an equal altitude, but converting to kinetic energy as it flows downhill, or over the dam.

This kinetic (or mechanical) energy is then converted to traditional electricity. This process is also an example of a renewable resource being utilized for everyday things (such as powering cars, homes. or charging batteries).