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

The definition of a resistor in an electrical circuit is that it is an object that impedes the flow of electrons. Resistors are essential components that limit the current that can flow through a circuit, allowing for the control of electrical energy. By providing resistance, they convert some of the electrical energy into heat, which is why they often become warm during operation. This property is crucial for protecting sensitive components in a circuit by preventing excessive current that can lead to damage.

The other options suggest functions that do not align with the primary role of a resistor. For instance, an object that speeds up electron flow would not be classified as a resistor, as resistors inherently slow down the flow of current. Similarly, an object that stores electric charge refers to capacitors, while an object that generates voltage typically describes a power source, such as a battery or generator. Thus, the characteristic of impeding electron flow accurately captures the fundamental function of a resistor in electrical circuits.