Toasters and lightbulbs.
AnswerA resistor is an circuit component. So, while toasters and light bulbs have resistance, they are not resistors!
A variable resistor means that the resistance can be varied, usually by using a slide. A fixed resistor can not be varied.
Hi, where there is no need of changing the value of resistor then why do you place variable resistor instead a fixed resistor. After all the selection of resistor depends on the cause of use in application. by the way wide range of resistor values are avilable in the market. if the application requires tuning operation then variable resistor is need to be mounted. nothing is mandatory unless the application requires. Regards, Manjunath A.V
connect the base of the transistor to a variable resistor and to a normal resistor
A variable resistor usually has three terminals, one of which is connected to the 'wiper' by which means its resistance is measured. By using all three terminals, we can control the potential difference in a circuit. When used in this way, we call the variable resistor a 'potentiometer'. By using two of the three terminals, one of which must be connected to the variable wiper, we can control the current passing through circuit. When used in this way, we call the variable resistor a 'rheostat'.
Rheostat
how do test a variable resistor
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.
possibly use a potentiometre
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 variable resistor means that the resistance can be varied, usually by using a slide. A fixed resistor can not be varied.
yes, a variable resistor
Variable resistor is an resistor that can change its resistance manually, by rotating a handle or a screw.
its the colour of the fixed and the variable we define it by its power and name
The volume knob on an audio device (radio, TV) is an example of a variable resistor. A variable resistor is also known as a potentiometer.
The volume knob on an audio device (radio, TV) is an example of a variable resistor. A variable resistor is also known as a potentiometer.
Variable resistor. The value of the variable resistor can be changed at any given moment.