SQA Higher Physics Practice Exam

The unit used to measure potential difference, commonly referred to as voltage, is volts. When we talk about potential difference, we are referring to the work done per unit charge to move a charge between two points in an electric field. This is a fundamental concept in electricity and electronics, as it helps us understand how electric circuits function.

The volt is defined as one joule of energy per coulomb of charge, which means that if a potential difference of one volt exists between two points, one joule of energy is required to move one coulomb of charge between those points. This unit is essential for quantifying how much energy is available to drive electric current through a circuit.

Understanding potential difference is critical in various applications, from designing electronic devices to analyzing electrical systems in practical scenarios. Consequently, recognizing volts as the unit for measuring potential difference is foundational knowledge in physics.