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This article mainly introduces the role of sliding rheostat, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to understand it.

The structure of the sliding rheostat generally consists of five parts: junction post, sliding vane, resistance wire, metal rod and porcelain cylinder. The sliding rheostat is an important component in the circuit, which changes its resistance by moving the position of the sliding vane. thus it plays the role of protection circuit and control circuit.

I. structure and principle

The sliding rheostat is an important component in the circuit, which changes its resistance by moving the position of the slide, so as to protect the circuit and control the circuit. The composition of sliding rheostat generally consists of five parts: connection post, sliding vane, resistance wire, metal rod and porcelain cylinder. In the circuit analysis, the sliding rheostat can be used as either a fixed resistance or a variable resistance. The resistance wire of sliding rheostat is generally Ni-Cr alloy with high melting point and high resistance, and the metal rod is generally metal with low resistance, so when the cross-sectional area of resistance is fixed, the longer the resistance wire is, the greater the resistance is, the shorter the resistance wire is, and the smaller the resistance is.

Second, the main functions:

(1) Protection circuit.

(2) change the magnitude and direction of the current in the circuit by changing the resistance of the access circuit, so as to change the voltage at both ends of the conductor (electrical appliance) connected in series. When connecting the sliding rheostat, it is required that "one up and down, the emphasis is on the bottom", the metal rod and the resistance wire each use a junction post; the actual connection should select the two terminal posts of the resistance wire according to the requirements.

(3) change the voltage. When exploring Ohm's law (I=U/R), it plays a role in changing the voltage at both ends of the electrical appliance connected in series with it.

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