Which of the following statements is true? 1. wind is the most commonly used renewable energy source in the united states. 2. hydropower uses the kinetic energy of water to generate electricity. 3. wind energy does not use a turbine or a generator to produce electricity. 4. solar energy can only be used on earth. it can't be used in space.

Hydropower is the most commonly used renewable energy source in the US follwed by wind energy.

Wind energy makes blades rotate which spins the generator to create the elctricity. Thats the principle of wind energy whereas hydropower works on the simple principle called *conservation of energy* in which potential energy of the water is converted into Kinetic energy which helps to rotate the turbines.

Solar energy can be used in space and we have already installed them in ISS(International Space Station)