All kinds of energy, some of it being:
- Light energy
- Thermal energy
- Magnetic energy
- Electrical energy
- Mechanical energy
- Gravitational energy
Geothermal, because it is one of the easiest to use and install.
Radios use eletrical energy
Yes. It takes energy to move them in the correct direction. In home telescopes, this is done by hand (energy from your muscles), in large telescopes they use some kind of motors to do that.
electric
potential energy
kinetic energy
Electrical energy.
chemical energy
Thermal energy heats your house in the winter.
aerobic
potential electrical energy
Mechanical Energy