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Electric heaters work because electric current is forced through wires that have a good deal of electrical resistance. When electric current flows through any resistance, it generates heat. Remember that moving electrons can be treated as moving waves, and the destructive interference of the atoms in the current path result in the scattering of electrons. This results in the generation of heat. All materials except superconductors have some electrical resistance. When more elctricity is flowing through a wire than it's capapcity, the wire will get hot. This is why the larger the current, the bigger the wire you need. If you ever try to use a small extension cord to power something like a vacuum cleaner or microwave oven, you will notice that the cord gets hot. Electric heaters work the same way. They push a lot of current through very thin specially made wires that have a lot of resistance. Hairdryers, irons, curling irons, portable heaters, toasters and toaster ovens, etc., all work like this. These devices use a lot of power, and you will often notice that using more than one on a single circuit will often trip the breaker. They have no insulation on the heater wires because the insulation would catch fire. Since the wire is bare, you can see it glow. Incandescent light work the same way, but the wire is very, very thin so not as much power is needed to light them up and they rarely trip breakers. They average about 75 watts where a hair dryer can be 1500-2000 watts. A toaster can be up to 3000 watts sometimes.

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βˆ™ 16y ago
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βˆ™ 13y ago

It consists of 2 chambers and lid: 1 for solid component; 1 for liquid. All process is exotermical chemical reaction. When you pierce the lid, liquid component mixed with the solid one and starts a reaction. The most common chemicals for the self heating can is Al + Mg + Zn or CaO (solid component), and HCl or H2O as liquid. That's all. Simplier than a bike. Just don't buy Ontech - they blowing up :) try to Google Wolfgang pack, really funny!

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βˆ™ 8mo ago

Self-heating devices typically have a chemical component that reacts with water to produce heat. This reaction is often triggered by a push of a button or activation of a mechanism that mixes the chemicals with water. The heat generated from the reaction is then used to warm up the device, such as food or beverages.

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βˆ™ 16y ago

A can which you push a button on the bottom to mix two chemicals together, which undergo an exothermic reaction which releases heat hence heats up the (coffee) to the perfect drinking temperature.

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βˆ™ 13y ago

It is simple really. As the temperature of an NTC (Negative temperature coefficient) thermistor decreases, the resistance increases this causes more friction to occur between the flow of electrons and the thermistors's material. Therefore thermal energy is dissipated/ given off.

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βˆ™ 11y ago

self heating cans carry out a exothermic reaction when the button at the bottom of the can is pressed. The chemicals it contains are harmless but it flammable and the chemicals can also vary.

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Q: How do self heating devices work?
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How did the development of self heating metallic alloy powders benefit the military?

Self-heating metallic alloy powders provided a reliable and compact source of heat for military applications, such as heating rations in the field or defrosting equipment in cold environments. Their portability and efficiency made them valuable for soldiers in remote locations where traditional heating methods may not be practical.


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A home heating boiler works by heating water and circulating it through pipes to radiators or underfloor heating. The heat from the water warms the surrounding air, providing efficient heating for the home. The boiler is fueled by natural gas, oil, electricity, or other fuel sources to maintain the desired temperature in the house.


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