Circuit Diagram Variable Resistor

Vout 1 25 v 1 25 x r2 r1 v.

Circuit diagram variable resistor. The potentiometer in a circuit diagram is represented as shown in the figure below. It is applied in an electronic circuit for adjusting circuit resistance to control voltage or current of that circuit or part of that circuit. It is a non linear semiconductor element and its name is obtained from the words variable resistor.

V r2 1 25 x r2 r1. Definition of variable resistor. Digital variable resistor circuit diagram will select the next resistor value from r6 r8 r10 r12 r14 r16 r18 r20 r22 r24.

These varistors are used as protective devices to avoid excess amounts of transient voltages such that to protect the components of the circuits and control the operating conditions of the circuits. Set the variable resistor to give the. The circuit can also be controlled with pulse or digital input from any other source.

Connect the circuit as shown in the diagram. The current through resistor r1 is i r1 and it is the same current that circulates through resistor r2 current i adj is neglected. Vout v r1 v r2 then.

Sometimes the resistance is adjusted at preset value as required at the time of circuit building by. V r2 i r1 x r2 2. When a variable resistor is used in a circuit to control the current flow it is known as a rheostat.

Here one of the fixed terminals and the moving terminal is used. If i r1 1 is substituted into the formula 2 the following equation is obtained. Then the voltage on resistor r2 is.