The charge that moves past a given point in a circuit per unit time is defined as the electric current. Therefore, if 150 coulombs of charge move past a given point in a circuit in 0.5 seconds, we can calculate the current flow as follows:
Current = Charge / Time
Current = 150 coulombs / 0.5 seconds
Current = 300 amperes
Therefore, the current flow in the circuit is 300 amperes.