NCEA Level 2 Electricity Practice Exam

Voltage measurements are expressed in volts. The volt is the standard unit of electric potential difference or electric pressure in the International System of Units (SI). This means that when we measure the voltage in a circuit, we are quantifying the potential energy per unit charge available to drive electric current between two points.

To clarify, amperes measure electric current, which is the flow of electric charge, while ohms measure electrical resistance, which indicates how much a material opposes the flow of electric current. Watts, on the other hand, represent electrical power, which is the rate at which electrical energy is transferred. Therefore, volts specifically relate to voltage, aligning perfectly with the measurement of electric potential difference.