TRONIC electrical components German TRONIC models TRONIC prices

TRONIC electrical components are current-limiting elements. When a resistor is connected in a circuit, its resistance is fixed, typically with two pins, limiting the current through the branch it is connected to. Resistors with unchangeable resistance are called fixed resistors. Those with variable resistance are called potentiometers or variable resistors. An ideal resistor is linear, meaning the instantaneous current through it is proportional to the applied instantaneous voltage. Variable resistors used for voltage division have one or two movable metal contacts pressed tightly against the exposed resistive body. The contact position determines the resistance between either end of the resistive body and the contact.