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A variable resistor (potentiometer) usually has a wiper and it is generally in between two outer legs, when you measure one outer leg to the other outer leg, you will have the value of the potentiometer, say 5kohms, when you turn the adjustment knob/screw; the wiper will most to one side or the other, reducing the resistance of the center leg to the outer leg and increasing the resistance of center leg to the other leg. when the wiper is in the middle, you should have 1/2 the value of the potentiometer from the center leg to the outdide legs. |__2.5k__↓__2.5k___| |_1k_↓_____4k___|
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Why you use resistor with 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.
What is the center terminal of a variable resistor called?
The center terminal of a variable resister is called a wiper.
List three variable resistor and list three fixed resistors?
mmg
What happens to the reading on an ammeter if the value of a variable resistor is increased?
it explodes and burns everyone in the room.
What is the advantage of including a variable resistor rather than a fixed resistor of know size in a potential divider that includes and LDR or a thermistor?
a three prong calisator with intermittent interphase
How do you test a variable resistor?
how do test a variable resistor
How connect a variable resistor to circuit?
how connect a variable resistor to circuit
Where is a variable resistor in your home?
If you have a light switch where you can brightener it or dim it that is a VARIABLE RESISTOR.
Does a variable resistor have a bias?
A variable resistor means that the resistance can be varied, usually by using a slide. A fixed resistor can not be varied.
Is Light dependent resistor an example of resistor?
yes, a variable resistor
Function of a variable resistor?
Variable resistor is an resistor that can change its resistance manually, by rotating a handle or a screw.
What is the difference between a fixed resistor and a variable resistor?
its the colour of the fixed and the variable we define it by its power and name
What is a variable resister?
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.
What is variable resistance?
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.
What is a resistor whose value can varied over a range of value called?
Variable resistor. The value of the variable resistor can be changed at any given moment.
Are transistor the same as the variable resistor?
no
Difference between variable and fixed resistor?
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.
