2.1 use the following units: ampere (A), coulomb (C), joule (J), ohm (), second (s), volt (V), watt (W).

These are the units you will need to know:

Ampere (A) - Current

Coulomb (C) - Charge

Joule (J) - energy

Ohm (Ω) - resistance

Volt (V) - potential / energy

Watt (W) - Power

Current - is the rate of flow of electrons