An electrical component known as a resistor restricts the passage of electric electricity. To supply the proper quantity of electricity to particular components inside an electrical gadget, one or more resistors can be used.

To restrict the quantity of electricity flowing through various electrical pathways, resistors are frequently glued onto a printed circuit board. It might not work if a component receives insufficient power. The component may be harmed if excessive current is permitted to flow through. As a result, resistors are crucial components of an electrical circuit.

Several types of resistors exist, but most are made up of carbon and an insulating material, such as ceramic. The current flows in one end and the remaining current flows out the other. The resulting current is inversely proportional to the resistance. This is defined in Ohm's law, which states that the current (I) is equal to the voltage (V) divided by the resistance (R).

• I = V / R

For a visible representation of their resistance levels, resistors are frequently color-coded. For instance, a normal axial-lead resistor has a tubular form and numerous colored bands. The first few lines stand for numbers, and the next streak is for a multiple (10x, 100x, etc.) The tolerance, which establishes the precision of the resistor, is represented by a line on the opposite end. A further line that indicates the temperature coefficient is sometimes included in resistors.