Yes.
yes
No, not all energy conversions give off heat. Some energy conversions, such as nuclear reactions and chemical reactions, can produce other forms of energy like light or sound instead of heat.
All people what or black give off heat.
On average, humans give off about 100 watts of heat energy.
it gives off a great deal of heat
One lamp won't do much. I have 10 and my room is always really hot when they are all on
No, ice does not give off heat. In fact, ice absorbs heat from its surroundings in order to melt and become liquid water.
Yes, it can give off intense heat.
The warmth you feel come from the Infrared rays.
Yes, it does.
but
they do