What is the function of a resistor in an electrical circuit?

A resistor plays a crucial role in an electrical circuit by opposing the flow of electric current. This resistance is measured in ohms and determines how much current will flow through the circuit for a given voltage. By providing opposition, a resistor can control the amount of current that reaches different components in the circuit, allowing for proper functioning and protection against excess current that could potentially cause damage.

Resistors are often used to adjust signal levels, divide voltages, bias active elements, and protect components from excessive current. The heat dissipated by a resistor when current passes through it can also be a useful aspect of various applications, although it typically represents a loss of energy in the form of heat.

Other functions mentioned, such as generating electrical power, storing electrical energy, or increasing voltage, directly contradict the primary purpose of a resistor, which is to limit current flow rather than enhance it or transform energy forms.