Sewer Collection Systems Operator Practice Test

Electric current is the flow of electric charges through a conductor. The unit that measures how much charge passes a point every second is the ampere. By definition, one ampere means one coulomb of charge moving past a point in one second. This is why the ampere is the standard unit for current. The other units refer to different quantities: volt is the potential difference that drives the current, ohm is the resistance to current, and watt is the amount of electrical power (voltage times current). In practice, currents can be small (milliamperes) or large (amperes), but the measure of how much charge moves per second is always expressed in amperes.