50% energy
I assume the answer is probably supposed to be "quasar", though they don't really "look like a star".
Quasar.
On average, humans give off about 100 watts of heat energy.
Because, it is booming hot.
If I understand the question correctly, you are thinking of a quasar. [See related question]
Infrared light doesn't "give off" energy; in this case, it IS the energy.
you give off calary and diet energy
No. Neither High or Low pressure Sodium Vapour lamps give off much energy in the UV wavelengths.
Quasar actually means quasi-stellar radio sources so we thought that it was giving off radio waves but we did not put into account the redshift that causes the stretching of the wavelength meaning that it most likely gives off microwaves.
Computers give off mostly heat, but also give off magnetism in the form of radio waves. Plus their displays give off light energy and the speakers give off sound waves. The fans inside create kinetic energy.
Yes you can you can print a picture off your computer or phone if you have a printer.
Electrical energy.