R=ρL/S (where ρ represents the resistivity of the resistor, which is determined by its own nature, L represents the length of the resistor, and S represents the cross-sectional area of the resistor).
Large-scale power supply equipment, medical equipment, electrical instrumentation and other products in use often need to absorb some of the excess power generated. The high power dissipation resistor used here is the load resistor. Load resistors are also known as discharge resistors, braking resistors, brake resistors, and absorber resistors due to their special function.
These resistors have high power and are generally non-inductive power resistors. Non-inductance, ultra-low inductance is an important requirement for these products, in the process of absorbing power to the excess power discharge, if the resistor's inductance is too large, it is easy to generate shock, other components in the circuit, the power supply and the device itself to produce harm, and even directly burned many internal devices.
Expanded Information:
Discharge Resistors, Load ResistorsThe subject matter to be considered in the production process is the non-inductive and heat dissipation properties of the product. The non-inductive performance is as mentioned above, and the heat dissipation performance is due to the discharge, the absorption of power will lead to a large amount of heat generated by the resistor itself, and thus the temperature rises rapidly.
So the material to ensure that the product's thermal performance is good, the shell of the best use of heat-resistant materials and metals, so that through the heat sink and other products, you can let the heat flow quickly to the outside world. At the same time, the process requirements are also very strict.
Dummy load
Dummy load is a substitute for the terminals in a circuit (such as amplifiers) or electrical output ports, receiving electrical power components, parts or devices called dummy load. The most basic requirements for the dummy load is the impedance matching and the power that can withstand. Informal loads are usually used temporarily during debugging or testing the performance of a machine.
Dummy loads can be categorized as resistive loads, inductive loads, capacitive loads and so on. Dummy loads for high-frequency transmitter circuits are mainly frequency-permissive, impedance should be matched, and can withstand the transmitter's power.
Baidu Encyclopedia - Load Resistance