Why do we need variable resistance?

Why do we need variable resistance?

The advantage of variable resistors is that you have more control over the voltage. You can also adjust the amount of voltage flowing through a circuit.

What is the purpose of a resistor in a circuit?

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.

Why is a variable resistor used in electrolysis?

In electrolysis is that the resistance of the solution changes as the reaction occurs. It is desirable to carry out the reaction as quickly as possible, which means the highest possible current. in order to continue operating at the maximum current, a variable resistance in series with a DC power supply can be used.

What is a variable electrical resistor?

An electronic component that is used to vary the amount of current that flows through a circuit. It works by sliding a wiper terminal across a resistive material, typically a thin film or chunk of carbon or a resistive wire made of nickel chromium or tungsten alloys.

What are variables in a circuit?

Independent variable: length of the wire. Dependent variable: resistance. Control variables: type of metal, diameter of the wire. Conclusion: As the length of the wire increases, the resistance of the wire also increases. Investigating Series and Parallel Circuits with Resistors.

How does a variable resistor work?

A variable resistor works by adjusting the path that current has to flow. The dial you turn will move another piece of wire inside the resistor. The end result is that the electricity will travel through a certain length of the strip depending on where you turn the knob.

Does variable resistor affect voltage?

So following the law a resistor must affect both voltage and current however the reality is that it only changes one size. you also find use cases where only voltage is affected.

How does a variable resistor change current in a circuit?

The variable resistor is a resistor that controls (increase or decrease) the flow of electric current when we vary or change its resistance. In other words, when we vary the resistance of the variable resistor, the electric current flowing through it will increase or decrease.

Why do you use a variable resistor?

A variable resistor is very important. It allows you to build a circuit with some degree of control . For example, a volume knob can be a variable resistor. It can act as a control on the amount of current flowing.

What are the uses of a variable resistor?

Applications of Variable Resistors Audio control Television Motion control Transducers Computation Home Electrical Appliances Oscillators

Does a variable resistor have have a fixed resistance?

The variable resistors are the one which offers variable value of resistance. Thus, it is also known as an adjustable resistor. Variable resistor has three leads, in which two leads are fixed, and one is movable. Thus, through with this movable lead the value of the resistance varies.

What are two uses for variable resistors?

Variable Resistor Applications They are used to control the speed of DC motors. They are used in household applications like to change the speed of ceiling fans. They are frequently used in laboratories in educational institutes and research wings for carrying out experiments. Other common applications of potentiometers are, controlling sound, light intensity, etc.