The document discusses electricity, electric current, Ohm's law, and electrical circuits. It defines electric current as the movement of electrons through a conductor caused by voltage. Ohm's law states the relationship between current, voltage, and resistance in a circuit. The document also covers connecting bulbs in series and parallel circuits as well as calculating circuits.

1. Unit 6.Electricity electric current.

2. Ohm's law.

3. Electrical circuit.