How do electrons provide power for electrical applicances? How does radiation operate?

your nerve in your skin a radiation recepters and when infer red radiation given off by the sun hit you your skin sends a signal to the brain telling you your are being hit by a alot of infer red your intert this as heat

and the electrons  question is tricky i think its to do with the negative charge of the electrons but a not sure sorry

energy can be in many forms.  When electrons move they can transfer several forms of energy.  One being kinetic energy...the physical moving of electrons contain energy itself.  The movement can give rise to heat energy (heat filaments to cause light and things like that).  Another energy available is the actually energy present in the electric field of the electrons. A moving electron also gives rise to magnetism which you can use to cause mechanical movement (cd tray opening, or a rotating motor or something).

Your skin is made of different nerve cells that detect different stimuli.  For instance you have nerve cells that can detect pressure.  These cells will not detect heat, or pain only pressure (non-extreme cases).  The cells that can detect different levels of heat are probably responsible for detecting sun light (may be a different nerve).  When the radiation comes into contact with your skin the appropriate skin nerves will be stimulated and send signals to your brain telling it that some kind of heat is on your skin

Radiation (like light from the sun) is actually an oscillating electric and magnetic field. These fields, will accelerate charged particles that come in their paths. Matter is all composed to charged particles, and so it gets accelerated in random directions when radiation hits it.
Heat is actually a measure of the random motion of particles, so just particles them in random directions will heat them up.