Due to limited resources of fossil fuels, it is important to focus on the development of alternative sources of energy. Scientists and engineers work together to create technologies to harness the energy from renewable resources, such as the sun and wind. Solar cells use the energy from the Sun and convert it to electricity. Wind turbines are also used to create electricity. The kinetic energy of the wind turns the blades and runs a generator. The energy from moving water can also be used to produce electricity. For example, the potential energy of water in a reservoir can be converted to kinetic and electrical energy in a hydroelectric plant within a dam.