The normal boiling point for h2se is higher than the normal boiling point for h2s . this can be explained by

H2se is a ionic bond which requires higher energy to change into a gas, while h2s is a covalent bond requiring less energy

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy