2.1 use the following units: ampere (A), coulomb (C), joule (J), ohm (Ω), second (s), volt (V), watt (W).
Ampere or Amps is used to describe the current in an electrical current.
Coulombs are used to describe the rate of flow of charge, in other words it's how many amps per second. (current / time)
Joules are used to measure quantities of energy transferred (voltage x current x time)
Ohms are used to measure resistance (voltage / current)
Seconds measure time.
Volts measure potential difference.
Watts measure power (current x voltage)
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