Resistors (Resistor), generally referred to as resistance in everyday life. Is a current-limiting component, after the resistance in the circuit, resistors resistance value is fixed to the two pins, it may limit the connecting branch through it's current size. Value cannot be changed for a fixed resistor. Variable resistance potentiometer or variable resistor. Ideal resistors are linear, the current through the resistor is proportional to the applied voltage. Voltage variable resistors. In naked resistance body, crushed one or two metal contacts. Contact either end position of resistance and contact resistance.