help~發熱線原理是什麼?

When energy is given to the system, the molecule is vibrated accordingly, the hotter it is, the more vibration it process.

Energy can be given to the system by
1) heat, I.e. Use a fire and heat the object
2) fiction I.e. By moving two object against each other or kinetic energy work against each other and produce heat
3) chemically, I.e. A chemical reaction take place e.g. Glucose burn in air and produce heat energy
4) restrict the degree of freedom, as a result molecule is limited to vibrate, eg presurised a large vol of gas to a smaller volume of gas, the temp will increase!
5) .....
There are many ways to increase the system temperature...

The Heating Element formed by the low-resistance resistor,
low resistance produce high current,as a result,a lot of heat and hight current are produced.

發熱綫係一種耐高溫導綫，它比其他導綫有較高電阻抗，通電後電子流動受阻產生摩擦而發熱。

electric energy change to heat energy lose to surroundings by conduction by some non-metal.