Most of the potential energy will be converted to thermal energy in this case.
Water.
Yes the sun does produce thermal energy.
compare the two stroke and four stroke engine in power output and thermal efficiency?
It can
of course
Yes
To produce electricity by the use of thermal energy in the form of heat.
no.
Thermal energy
Not directly.
Calories don't "produce" energy; calories are a UNIT OF ENERGY.
Thermal energy relies on temperature because it uses the heat to produce energy.