what is the use of variable resistor in ohms law experiment
Answers
Changing the resistance
You could increase or decrease the resistance in a circuit by using a variable resistor . The symbol for resistance is R, it is measured in ohms. The symbol for voltage is V, it is measured in volts.
Variable Resistor – Working, Construction, Types & Applications
One of the critical pieces in an electric circuit, the resistor is the most omnipresent electronic component. Available in wide varieties, these resistors can be used in various applications. Resistors are broadly classified as fixed and variable resistors, according to the type of resistance value they offer. Here, in this article we shall discuss about variable resistors, its definition, types and uses.
What is a Variable Resistor?
A variable resistor is the type of resistor which changes the flow of current in a controlled manner by offering a wide range of resistances. As the resistance increases in the variable resistor the current through the circuit decreases and vice versa. They can also be used to control the voltage across devices in a circuit too. Therefore, in applications where current control or voltage control is needed, these type of resistors come handy. Figure 1 shows some real life variable resistors
.Variable Resistor: Working Principle and Construction
When we use the term variable resistor, it means we are talking about linear resistors by default. Linear resistors, as we know are those resistors whose resistance remains constant, even when the voltage and current through it changes. The voltage and current follow ohm’s law and are proportional to each other.
A typical variable resistor has 3 terminals. Out of the three, two are fixed terminals at the ends of a resistive track. The terminals are made of conducting metal. The other terminal is a moving terminal, mostly known as the wiper. It is the position of this terminal on the resistive track that decides the resistance of the variable resistor.
Variable Resistor Characteristics
The most important characteristic of a variable resistor is given by the relation between the mechanical position of the moving terminal and the resistance ratio. It is marked on the resistor as its taper. Mostly two types of taper are marked, namely linear and logarithmic taper. Linear taper indicates that the relation between the two is linear, meaning the resistance ratio will be directly proportional to the mechanical position. This when drawn in a graph, will have a straight line with a constant slope.
The other type of taper is the logarithmic taper. This means the relation between the mechanical position and the resistance ratio is logarithmic, when plotted in a graph. The resistors with this type of taper are mostly used in audio control.
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