The difference in electrical charge between two points in a circuit is referred to as:

The difference in electrical charge between two points in a circuit is referred to as voltage. Voltage, also known as electric potential difference, is the measure of the work needed to move an electrical charge from one point to another within an electric field. It is what drives the flow of current in a circuit, creating the potential for the current to move through the circuit elements.

Voltage is measured in volts and is typically represented in circuits by the symbol "V." It is essential for understanding how electrical devices operate; without sufficient voltage, current will not flow effectively, and electrical devices will not function as intended.

In contrast, current refers to the flow of electric charge in a circuit, measured in amperes. Resistance is the opposition to the flow of current and is measured in ohms, while frequency relates to the number of cycles per second in alternating current (AC) systems, measured in hertz. These terms are important in the context of electrical engineering, but they do not describe the difference in electrical charge between two points, which is the definition of voltage.