A resistor is a passive electrical component that limits the flow of electric current in an electronic circuit :
Resistors are used to regulate the flow of electric current, adjust signal levels, divide voltages, and more.
Resistors introduce resistance to the current, which controls the amount of voltage that reaches various components within the circuit.
Ohm’s Law
In direct-current (DC) circuits, the current through a resistor is inversely proportional to its resistance. This is known as Ohm’s Law.
There are many types of resistors, including carbon film, metal and metal oxide film, wirewound, and metal foil.
A good understanding of resistors is important for designing and understanding electronic circuits.