Power resistance is also called a heating resistor or load resistance, which mainly plays a step in step-down and current limiting in the circuit.According to the ohm’s law voltage = current × resistor, the patch resistance will definitely reduce the current in the circuit and generate a certain pressure drop.
In fact, all resistors only have to be resistant, but our daily application circuits are small current circuits, and the power requirements of the resistor are not prominent, and the power used by the electric resistance itself is also very small, so they have not done more requirements..
If in the large current circuit, the power of the resistor must be required, otherwise the small power resistance is easy to burn out because of the material problems.
The power size of the resistor depends on the material, process, size of the resistor. How is the power of the resistor determined? Generally, the power of the material and the process resistance can be associated with the dimension.