Not sure about a bruise, but yes a heating pad can cause burns. If it malfunctions it can burn. Also, some people have been burned even with a properly working heating pad. That is why you should always be cautious in using them.
electric
The electric heating elements within the tank must remain immersed in water. If the power is not disconnected before draining the tank, the elements will get too hot and will burn out. if the tank is sitting idle but remains full of water, then they should not burn out.
Oil core electric skillets are top of the line! the heating element is encased below the surface and submerged in oil to provide even heating across the entire pan surface. Ever see that burn ring on the surface of a old standard electric skillet? Very uneven cooking.
Electric baseboard heaters are not supposed to cause soot. However; dust settles on the elements. When the electricity is turned on, the dust will burn off. There will be a trace of soot from that dust.
the reason a power plug burn out in two weeks is because the mettle part gets over heated which cause a electric shock.
A bruise (called a contusion) can burn, itch, feel warm or hot, feel tender or ache, etc. The best explanation is that our skin has millions of sensory nerves. A bruise results from minor bleeding under the skin. This can stretch the skin slightly. This slight stretching can cause the 'symptom' you describe.
sprain, bruise, cut, burn, bump
Methan burn in air by heating.
There are roughly two types of solar power: Thermic (Solar heating) and Electric (PV) Risks are only the risks like handling any kind of powered equipment generating/using heat or electricity. So Solar heating heating can cause fire, stream burns (As used by concentrating solar mirrors) , mechanical overload. PV can cause electrocution and fire by short circuit. By comparisment with other ways of power production the risks are lower. There is no fuel that can burn/explode and no waste that is either toxic or radioactive.
Cigarette lighter not work?I read in my car owner manual, and it tells me that the reason why a cigarette lighter will stop working is because the heating mechanism is burned out. I'm not sure exactly what it is or what is a definite answer for why it would burn out. But one reason was given. It said if you take the lighter out before it pops up, that it would cause the heating mechanism to burn out faster.
They all burn.
If you really do mean the ionosphere, and the astronaut is falling back to earth, the ionosphere is one of the upper layers - my best guess is that the heating effect of the rarified ionosphere would not be enough to cause death.Once you get into the lower atmosphere, though, the heating effect is large (the Concorde supersonic airliner expanded measurably while at full flight speed due to heating), and will cause burning up.