Red Seal Construction Electrician Practice Exam

Which of the following terms describes the opposition to the flow of electric current?

1. Current

2. Voltage

3. Resistance

4. Power

The correct answer is: Resistance

The term that describes the opposition to the flow of electric current is resistance. In electrical circuits, resistance is a fundamental property that determines how much current will flow through a conductor when a voltage is applied. It is measured in ohms (Ω) and is influenced by factors such as the material, length, and cross-sectional area of the conducting wire. Current refers to the flow of electric charge and is measured in amperes (A). Voltage is the electrical potential difference between two points, measured in volts (V), which drives the flow of current through a circuit. Power, measured in watts (W), represents the rate at which electrical energy is converted or used in a circuit, which depends on both current and voltage. Resistance plays a crucial role in controlling the amount of current in a circuit and is essential for the proper functioning of electrical devices. Understanding resistance is vital for electricians, as it affects everything from circuit design to troubleshooting.