The adjustable resistor can adjust the size of the resistance size, which can adjust the size of the current in the circuit. The general varistor is made of a wire (resistance line) having a large resistance and a device that can change the contact point to adjust the effective length of the resistance line.
Variable restrictions: 1, limit current, protection circuit; 2, change the distribution of voltage in the circuit.
Sliding varistors are one of the commonly used devices in the electrical, and its working principle is to change the resistance by changing the length of the partial resistance line of the access circuit, thereby gradually changing the current size in the circuit. The resistive wire of the sliding varistor is generally a high melting point, the electrical resistance is a nickel-chromium alloy. The resistive bar is generally small metal, the longer the resistance, the larger the resistance, the shorter the resistance, the smaller the resistance.
The insulating layer is applied outside the resistor, wound around the insulating tube, and its two ends are connected to the two terminals of A, B. The slide P is connected by the metal rod and the terminal C, and the slide is moved to different positions, and the length of the two terminals between the two wiring cylinders is different so that the size of the resistance in the access circuit can be changed. The general varistor is composed of a larger electrical wire and a device that can change the contact point to adjust the effective length of the resistance line. Sliding varistor construction: 1. Tunction
2. Slice 3. Coil 4. Metal rod 5. Porcelain. Principle: The metal rod resistance is small, and the current is scribed from the wire to change the length of the resistance wire access circuit, and the size of the resistance is also changed.
The resistance wire of the sliding varistor is wound around the insulating porcelain, and most of the sliding varistor resistors is a nickel-chromium alloy wire, and the electrical resistance is applied with an insulating layer.