In an electrical circuit, the measure of energy per unit charge is known as what?

Voltage is defined as the measure of energy per unit charge in an electrical circuit. It represents the electrical potential difference between two points and indicates the amount of work needed to move a charge from one point to another. This is crucial for understanding how electric circuits function since voltage affects how current flows through the circuit and ultimately determines the energy available to perform work.

Power, while related to voltage, is the rate at which energy is transferred or converted, measured in watts. Current refers to the flow of electric charge, while resistance is the opposition to the flow of current in a conductor. Each of these terms relates to voltage but does not define the energy per unit charge itself. Understanding voltage is foundational in electronics and electrical engineering, as it sets the stage for the relationships among current, resistance, and power in Ohm's Law and circuit analysis.