Electronic symbol of variable resistor
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Variable Resistor – Working, Construction, Types & Applications
Hosted By. Variable resistors are still used this written in various electronic devices, for example, as volume controls in amplifiers, dimmer circuits for lights etc. They have, in many cases, been replaced by digital circuits but some of the same principles still apply. In this circuit, notice that only two of the connections of the variable resistor are being used. In what follows, we will assume that the maximum resistance of the variable resistor that is, the resistance between points A and B is 10 0 W.
When the sliding contact, S is moved to A, the voltmeter will read 6 V. In this situation it will be connected directly to both sides of the supply.
However, what will be the reading of the voltmeter is S is moved to B? Clearly, the voltmeter will read 3 V see here if in doubt. We will now consider using all three connections of the variable resistor to make a variable potential divider. With S connected to A, the situation is as before, therefore the voltmeter reads 6 V.
However, with S moved to B, the wire x that we have added assumed to have zero resistance is now in parallel with the 10 0 W resistor.
NB The circuit symbol for the variable resistor is not usually drawn like this. Hence a variable potential divider circuit is more useful as a supply of variable voltage. However, it should be noted that a system like this does not provide a stable variable voltage supply. If we connect only a voltmeter, as shown here, we can predict its reading, knowing the position of S. Remember that, if we are using a suitable voltmeter, it will have a resistance that is very much higher than the other components in the circuit.
If we now connect a component having a resistance of 5 0 W for simplicity of calculatio n! Two 5 0 W components in parallel have an effective resistance of 2 5 W so the voltage indicated by the voltmeter will now be one third of the supply rather than one half as above, so V now equals 2 V. The voltage can still be varied from zero up to the voltage of the supply but it also varies depending on what we connect to the variable potential divider.
100+ Electrical & Electronic Circuit Symbols
Circuit symbols are used in circuit diagrams showing how a circuit is connected together. The actual layout of the components is usually quite different from the circuit diagram. To build a circuit you need a different diagram showing the layout of the parts on breadboard for temporary circuits , stripboard or printed circuit board. A 'blob' should be drawn where wires are connected joined , but it is sometimes omitted. Wires connected at 'crossroads' should be staggered slightly to form two T-junctions, as shown on the right. In complex diagrams it is often necessary to draw wires crossing even though they are not connected.
Unit 3. Voltage, Current, & Resistance
From Wikimedia Commons, the free media repository. File information. Structured data. Captions English Add a one-line explanation of what this file represents. Description Variable resistor symbol. The image is oriented for horizontal presentation. Author K. Bolino User:Kbolino Permission Reusing this file Released into the public domain by the author and uploader. I, the copyright holder of this work, hereby publish it under the following licenses:. You may select the license of your choice.
Circuit Symbols
Even though they are passive components, they are still used very extensively. Accordingly resistor circuit symbols are found in virtually all circuit diagrams or schematic diagrams. The complete circuit symbol for the circuit diagram or schematic are associated with the PCB shape so that the PCB design can be developed electronically from the electronic copy of the circuit. There are several different types of resistor for which distinct circuit symbols are required.
Variable Resistor Symbol
A resistor whose resistance value can be adjusted as per requirement is called as Variable Resistor. The two most common used variable resistors are Rheostat and Potentiometer. We will see each of them in details. We usually refer Potentiometer as a POT. These POT are available in different values.
Electrical Circuit Symbol With Variable Resistor
It is the symbol of a fixed resistor. An attenuator works opposite to the amplifier. It reduces the power of the signal without distorting it. The symbol of attenuator is given above. Preset Resistor. It is a variable resistor whose resistance is adjusted during manufacturing or designing of the circuit. It is not changed during normal use of the circuit.
Variable resistors are resistors that change resistance from zero to a certain maximum value. They are commonly used as volume controls and in voltage regulators. Potentiometers are used to vary the resistance in a circuit by turning a rotary knob.
Kuphaldt et al. Source: All About Circuits. Because the relationship between voltage, current, and resistance in any circuit is so regular, we can reliably control any variable in a circuit simply by controlling the other two. Perhaps the easiest variable in any circuit to control is its resistance. This can be done by changing the material, size, and shape of its conductive components remember how the thin metal filament of a lamp created more electrical resistance than a thick wire? Special components called resistors are made for the express purpose of creating a precise quantity of resistance for insertion into a circuit.
Hosted By. Variable resistors are still used this written in various electronic devices, for example, as volume controls in amplifiers, dimmer circuits for lights etc. They have, in many cases, been replaced by digital circuits but some of the same principles still apply. In this circuit, notice that only two of the connections of the variable resistor are being used. In what follows, we will assume that the maximum resistance of the variable resistor that is, the resistance between points A and B is 10 0 W. When the sliding contact, S is moved to A, the voltmeter will read 6 V.
A 'blob' should be drawn where wires are connected joined , but it is sometimes omitted. Wires connected at 'crossroads' should be staggered slightly to form two T-junctions, as shown on the right. In complex diagrams it is often necessary to draw wires crossing even though they are not connected. I prefer the 'bridge' symbol shown on the right because the simple crossing on the left may be misread as a join where you have forgotten to add a 'blob'!
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