Resistors are generally called resistors in daily life. It is a current limiting element. After connecting the resistor to the circuit, the resistance of the resistor is fixed, usually with two pins, which can limit the current through the branch it is connected to. The resistor whose resistance cannot be changed is called a fixed resistor. The resistor whose resistance is variable is called a potentiometer or a variable resistor. The ideal resistor is linear, that is, the instantaneous current passing through the resistor is proportional to the applied instantaneous voltage. Variable resistors used for voltage division. On the exposed resistor body, one or two movable metal contacts are pressed tightly. The position of the contact determines the resistance between any end of the resistor body and the contact.
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