show the symbol of variable resistance circuit

 Variable Resistor concept

Variable Resistor Construction

Show the symbol of variable resistance circuit: In an electrical circuit, a switch is used Bus to turn the power on and off Like a valve is used to circulate the water on and off.

•There are times when you want

A little water but not all is needed

water that the pipe can deliver, so

You control the water flow by adjusting

tap.

•Unfortunately, you can't adjust it

already thin wire thickness.

However, note that you can

control water flow by forcing

water through an adjustable length of

rocks, as shown on the right.

Variable resistor operation

• Moves and sets the dial hand contact on the variable resistor

The resistance between the left and center pins. remaining resistance of

The part is between the center and right pins.

•For example, when the dial is turned all the way to the left, the minimum is

Left and center pins (usually 0) and max. resistance between

The resistance between the center and right pins. resistance among the left

And the right pin will always be the total resistance.

Variable Resistor 

 

Resistor formula

• For a resistor made using a homogeneous material

R =where /Specific resistance (physical property) of the material

L = length of conduct

A = cross-section area of ​​the conductor used to make the resistor

Read: What is a Digital Multimeter