A resistor is an element that limits the flow of current. It can control the size of the current as well as regulate voltage. When current passes through a resistor, heat is generated, so resistors can also be used as heating elements.

Why use resistors?

Resistors limit the size of the current. This is crucial for protecting components from damage due to excessive current.

Resistors can control voltage. This is crucial for precisely regulating the working voltages of multiple different components within a system.

Resistors can heat elements. This is important for more efficiently converting energy into heat when using heating elements in a system.