What is voltage defined as in a circuit?

• A. Flow of electrons
• B. Electrical potential difference
• C. Resistance to flow
• D. Power consumption

Answer: (B)

In a circuit, voltage is defined as the electrical potential difference between two points. This potential difference is what drives the flow of electrons through a conductor, allowing electric current to flow. Voltage can be thought of as the force that pushes electric charges through a circuit, similar to how pressure pushes water through a pipe.

The value of voltage dictates how much energy is available to move electrons. When components in a circuit have different electrical potentials, this difference creates the conditions necessary for current to flow. Without voltage, there would be no potential for current and circuit functionality would be impeded.

Understanding voltage as an electrical potential difference is crucial because it lays the foundation for analyzing circuits, predicting their behavior, and troubleshooting any issues that may arise in electrical systems.