Charge & Current

What flows in a wire

An interactive lesson with 7 steps, about 6 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Current is charge per second: I = Q/t, measured in amps (1 A = 1 C/s).
• Electrons drift slowly, but the whole wire starts moving at once.
• In a single loop, the current is the same everywhere. Charge is never used up.

Steps

1. Flip the switch
2. A pipe already full
3. Charge
4. Current
5. Count the charge
6. Used up?
7. Phone charge