Unit PAs petaampere-second Electric Charge Petaampere-second (PAs) is a unit of electric charge used in the field of electromagnetism and electricity. It is derived from the product of two units: the petaampere (PA) and the second (s). A petaampere (PA) is a measure of electric current and is equivalent to 10^15 amperes, where 1 ampere is the SI base unit for electric current. It quantifies the flow of electric charge, or the rate of charge transfer, through a conducting medium, such as a wire. Second (s) is the SI base unit for time, and it helps define the time duration over which the electric current (measured in petaamperes) flows in the circuit. The unit petaampere-second (PAs) therefore represents the total electric charge transferred through the circuit at the rate of 1 petaampere for a duration of 1 second. In more general terms, 1 PAs is equal to 10^15 coulombs, since 1 ampere-second is equal to 1 coulomb. The Coulomb is the standard SI unit for electric charge, and it provides a more common way to express the quantity of charge moved in a circuit.