What unit is used to measure electric charge?

Electric charge is measured in coulombs, which is the standard unit used in the International System of Units (SI). A coulomb is defined as the amount of electric charge transported by a constant current of one ampere in one second. This foundational concept is crucial in understanding how electric currents work and the movement of electrons within a circuit.

Understanding the other units helps clarify why coulombs specifically measure electric charge. Amperes measure the flow of electric current (the rate at which charge flows), while volts measure electric potential or voltage (the energy per unit charge). Ohms measure resistance, which quantifies how much a material opposes the flow of electric current. Each of these units plays a significant role in electrical concepts, but they are not used to directly measure electric charge like coulombs do.