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wilhelm huber electrical component is a current-limiting element. After connecting a resistor in the circuit, the resistance value is fixed, typically with two pins, and it can limit the current magnitude through the branch to which it is connected. Resistors with unchangeable resistance values are called fixed resistors. Those with variable resistance values are called potentiometers or variable resistors. An ideal resistor is linear, meaning the instantaneous current through the resistor is proportional to the applied instantaneous voltage. Variable resistors used for voltage division. On the exposed resistive body, one or two movable metal contacts are tightly pressed. The contact position determines the resistance between any