Electrical IBEW Practice Test 2025 - Free IBEW Practice Questions and Study Guide

The component that limits the flow of electric current is the resistor. Resistors are used in electrical circuits to provide a specific amount of resistance, which controls the current flow according to Ohm’s Law. According to this law, the relationship between voltage (V), current (I), and resistance (R) is defined as V = I × R. By increasing the resistance, the current can be decreased for a given voltage.

Resistors can be used for various purposes, such as protecting sensitive components from excessive current, dividing voltage, and setting biasing conditions in electronic circuits. Their primary role is to manage and control current flow within electrical systems, ensuring that other components operate within safe and specified limits.

In contrast, other components mentioned serve different primary functions; for example, capacitors store and release electrical energy, inductors store energy in a magnetic field, and transistors are used for switching and amplifying signals. While all these components have their unique roles, it is the resistor specifically that is recognized for its function in limiting electric current in circuits.