Uses of Resistor

Uses of Resistor

We know that one of the main uses of resistor is to control the flow of current. In a resistor, electrons have a collision with ions which slows down the flow of electricity and lowers the current and also produces heat. If a resistor is said to have high resistance then it means less current flows in it for the given voltage.

Some applications and uses of resistor is listed below:

  • Circuit functions
  • Dividing voltage
  • Heating
  • Frequency and timing
  • LEDs and transistor

Resistor usage in Circuit Functions

There are various types of resistors which works according to the usage range. In that, we can set the resistance by using a knob kind of feature. Changing resistance will affect the flow of current inside the circuit. For example, this type of resistors is used in controlling speed of a motor, pitch of a musical tone, loudness of an amplifier etc.

Resistor is used for Diving Voltage

Dividing the voltage works when some components need to work in a much lesser voltage than the supplied input voltage. Connecting the resistors in a series will help dropping the voltage across each resistor equally, thus, assisting the appliances smoothly which work in those conditions.

It is also used for Heating

Because of the nature of generating heat when conducting current, resistors are used in a heater, toaster, microwave, electric stove and many more heating appliances. In a light bulb, the metal filament glows white-hot due to very high temperature produced from the resistance when electricity if passed through it.

Uses of Resistor to function in particular Timing and at a certain Frequency

Like in a light flasher, electronic sirens, blinking lights used in airplanes or tall towers which acts as a collision avoidance measure. They work on the principle of filling up current upto a certain time and then discharge light, in here, the resistor decides how much current has to be passed according the time allotted. If resistance increases, the time for discharging current in the circuit increases.

Resistors used in LEDs and Transistors

Too much current passed inside a LED or a transistors can be dangerous because they are very sensitive to electric current. Use of a resistor in the circuit will help the LEDs and transistors and other types of semiconductors to function in the desired current range ideal for them.

These were some applications of Transistors. If you wish to find out more, download BYJU’S The Learning App.


Practise This Question

What is the audible range of frequencies for human beings?