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Resistor is a current limiting component, after the resistor is connected in the circuit, the resistance of the resistor is fixed and generally two pins, which can limit the size of the current through the branch it connects.
The value of resistors cannot be changed are called fixed resistors. Variable resistance is called potentiometer or variable resistor. The ideal resistor is linear, which the instantaneous current through the resistor is proportional to the applied instantaneous voltage. Variable resistor is used for voltage division. On the exposed resistor body, one to two removable metal contacts are pressed. The contact position determines the resistance between either end of the resistor body and the contact.
The resistance of a resistive element is generally related to temperature, material, length, and cross-sectional area. The physical measure of the effect of resistance on temperature is the temperature coefficient, which is defined as the percentage change in resistance at each temperature rise of 1°C. The main physical characteristic of a resistor is that the variable electrical energy is thermal energy. It can also be said to be an energy-consuming element through which the internal energy is generated. Resistors usually function as voltage dividers and shunts in circuits. For signals, both AC and DC signals in circuits can pass through resistors.