A variable resistor is used in cicuits to vary the current passing through the resistor. It is commonly used to change the value of current across a circuit, or to act as a voltage divider.
They are commonly equiped with a knob outside of a cabinet, to enable the user to adjust the operation of a circuit, like a volume control on a radio or amplifier.
how do test a variable resistor
Variable resistor is an resistor that can change its resistance manually, by rotating a handle or a screw.
how connect a variable resistor to circuit
If you have a light switch where you can brightener it or dim it that is a VARIABLE RESISTOR.
A rheostat is essentially a variable resistor. It is used in circuits to drop voltage or limit current.
yes, a variable resistor
A variable resistor means that the resistance can be varied, usually by using a slide. A fixed resistor can not be varied.
A variable resistor is most commonly used for volume controls or lighting dimmers.
its the colour of the fixed and the variable we define it by its power and name
the function of variable resistor is to provide variable resistances in circuitary , its also do the function of providing different values of current to different components....
If the two of the three terminals on a Potentiometer are used, then it may be used as a variable resistor.AnswerA variable resistor may function as a potentiometer (using three terminals) or as a rheostat (using two terminals). Its correct name is 'variable resistor', while the terms 'potentiometer' or 'rheostat' describe how it is being used.
A potentiometer and a rheostat are two different applications for a variable resistor.A potentiometer is a variable resistor, connected (using its three terminals) as a variable potential divider.A rheostat is a variable resistor, connected (using two of its three terminals) to adjust current.
Variable resistors means that a resistor which can change its resistance by control by any person or it self and fixed resistor means that it can not change its value.
VDR stands for Voltage Dependent Resistor .It is also called Variable Resistor or Varistor.
The purpose of colored bands on a resistor is to tell whoever is installing the resistor the amount of resistance that particuliar resistor has.
Often we want to easily change a resistor value, so we use a variable resistor. For example, we may want to change the resistor that controls the power sent to a LED, so we can easily make it brighter or dimmer. Often if we use a variable resistor, there is only a very narrow range that is useful. Continuing our example, sometimes we use several LEDs, and we use the variable resistor to set them all to the same brightness. In this case, the resistance range that sets the LED to be twice as bright as the the other LEDs, and the resistance range that sends so much power to the LED that it is permanently destroyed is even less useful. So we add a fixed resistor in series with the variable resistor -- the fixed resistor sets the minimum net resistance, no matter how we turn the knob on the variable resistor. In our example, the addition of the fixed resistor allows us to turn the variable resistor throughout its whole range, and the LED gets brighter and dimmer; without that resistor, a certain range of the knob on the variable resistor would allow so much power to go to the LED that it would be destroyed.
Main matterial of variable resistor is same with constant value resistor. Assume that there is a cylindrical resistive material in the component and the resistance of the material depends on its lenght. When you adjust the variable resistor, it changes the lenght of active part of the resistive material so the output resistance changes.
using a variable resistor we can adjust the sensitivity of a light dependent resistor
The difference between a variable resistor and a rheostat is the same as the difference between six and half a dozen.
a blower motor
It is a variable resistor. Basically, the same as when you turn up or down the heat on an electrical oven or radio.
As one increases the resistance of the variable resistor, the potential difference/ Voltage would decrease. As additionally, according to Ohms law R =V/I, the current would increase across the variable resistor.