Typically, high power resistors are designed to dissipate more than a normal resistor. This can help prevent overheating, but it can also cause damage to equipment. They are found in a wide variety of applications, including power converters and motor braking. They can also be used in test measuring equipment.
Power resistors are made from different materials, and their power rating depends on the materials used. They can be constructed from carbon film, thick film, ceramic, or metal alloy. Some common power resistor materials include nickel-chromium, ceramic, and thin film. The power rating also depends on the ambient temperature. When used in high power applications, resistors must be made from materials that can withstand high-temperature changes.
Resistors are commonly used in power generation applications, but they are also found in material handling equipment, elevators, and power inverters. In many cases, they are used in chassis-mounted or through-hole systems. The mounting style can affect their performance. Other common mounting styles include surface mount technology and axial leads.
Resistors can also be made from helical wire technology, which is a coil-shaped wire wrapped around a cylindrical core. This type of winding can produce magnetic fields that can affect performance. Similarly, edge-wound resistors are made by winding a metal strip by a wider edge. Edge-wound resistors are usually air-cooled, and they dissipate more power than helical resistors.
Generally, high power resistors are rated at least 2W, but they can range from as little as one-tenth of a watt up to hundreds of watts. They are often found in converters, where they take over the function of di/dt filtering or current limiting. They are also used in locomotives, where they help convert kinetic energy into heat.
Wire-wound power resistors are often covered with non-conductive paint. The resistance of these resistors is lower than that of carbon film resistors. They are also used in controlled power supplies, heating elements, and test measuring equipment.
Other common substrate materials used for high power applications include alumina, silicon carbide, and metal oxide. Resistors made from these materials can withstand temperatures of up to 1200oC. They are also used in high power snubbing circuits. They are also used in high-precision feedback circuits for power supplies.
High power resistors are also used in power conversion applications, such as motor braking. They can also be used as load banks in electric substations. They are also used in the electric power trains of high-speed trains. They are also used in electric cars. In these applications, they are used to take over the function of braking resistors.
In addition, they can be used in power conversion applications, such as power inverters and amplifiers. They are also used in industrial drives, escalators, and trams. Their power rating is determined by their construction, and their maximum power rating can vary from as little as one-tenth of one watt to hundreds of watts. In addition, they can be used at any voltage. For a general overview of this topic, click here: https://www.britannica.com/technology/resistor.