A variable resistor is a resistor of which the electric resistance value can be adjusted. A variable resistor is in essence an electro-mechanical transducer and normally works by sliding a contact (wiper) over a resistive element. When a variable resistor is used as a potential divider by using 3 terminals it is called a potentiometer.. A variable resistor constitutes a resistor whose electronic resistance measurement may be altered at will. It is a typical element in electrical circuits that enables current or voltage control in accordance with Ohm’s Law.
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To calculate the output voltage of a voltage divider, use the Voltage Divider Equation below: R1 is the resistor closest to the input voltage, R 2 is the resistor closest to ground, V in is the input voltage, and V out is the output voltage. Potentiometers are basically just adjustable voltage dividers. Potentiometer Schematic Symbol.. The main difference between a fixed resistor and variable resistor is that a fixed resistor has a fixed resistance, whereas the variable resistor has variable resistance (it has a range of resistances which you can set using a knob or slider). There is more to just resistance when it comes to the differences between a fixed and variable.
