Electric heating principle

In 1840, the British scientist Joule discovered through experiments that the heat generated by the current through the resistor is proportional to the square of the current, proportional to the resistance, and proportional to the energization time, namely: Q = I2Rt. Resistive electric heaters use the resistance of a conductor to generate heat to heat. Because the current passes through the conductor, the conductor obstructs the current, and the current has to overcome the resistance of the conductor to do work, because the conversion of energy is measured by work, so How much work is done by the current, how much electrical energy is converted into heat. This is the heating principle of a resistive electric heater.

Supplementary note: The thermal effect of current is a phenomenon in which the temperature of the conductor rises when current passes through various conductors. When a current passes through a conductor, if the electrical energy is completely converted into internal energy and not converted into other forms of energy, then the electric heating is exactly equal to the electrical work. In this case, Joule's law can also be derived using the electric work formula and Ohm's law.