A current is a flow of charge, measured by an ammeter in series. In the wires the carriers are electrons, drifting from the negative terminal round to the positive. Conventional current is drawn the other way, from positive to negative. A mystery supply drives the circuit each round: watch how the carriers move, decide whether it is direct or alternating current, then reveal the current-time graph to check.
MissionWatch the carriers, then decide: direct current or alternating current?Round 1Streak 0Best 0
This mystery supply is:
Watch the electrons. Steady one way, or sloshing back and forth?
carriers in the wireelectrons (negative)
electron flownegative terminal to positive
conventional currentpositive terminal to negative
supplymystery
Current is a flow of charge, measured by an ammeter in series. d.c. flows one way; a.c. keeps reversing.