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

The function of a resistor in an electrical circuit is to limit the flow of electrical current. A resistor does this by providing a specific amount of resistance to the flow of current. When the current flowing through the electrical circuit changes, a resistor will adjust to limit the amount of current that can pass through at any given time. This characteristic makes resistors essential for controlling voltage and current within a circuit, allowing for safe operation of electronic devices and components.

In essence, a resistor plays a crucial role in managing the flow of electricity, ensuring that components receive the appropriate amount of electrical power they require for proper functioning. This is particularly important in sensitive electronic circuits where excess current could cause damage.

The other choices do not accurately describe the primary function of a resistor in an electrical circuit. For instance, while some components might block all current or only allow alternating current, resistors do not have these restrictive properties. Similarly, resistors do not amplify electrical signals; their primary role is to limit and manage current flow rather than enhance it.