Equations

• Power = current ✖️ Potential difference

  P = I ✖️ V

  power = watt ( W )

  current = amps ( A )

  potential difference = volts ( V )
• Potential difference = current ✖️Resistance

  V = I ✖️ R

  potential difference = volts ( V )

  current = amps ( A )

  resistance = ohms ( Ω )
• Charge = current ✖️ Time

  Q = I ✖️ t

  charge = coulombs ( C )

  current = amps ( A )

  time = seconds ( s )
• power = current squared ✖️Resistance

  P = I² ✖️R

  power = watts ( W )

  current = amps ( A )

  resistance = ohms ( Ω )
• energy = charge ✖️potential difference

  E = Q ✖️ V

  energy = joules ( J )

  charge = coulombs ( C )

  potential difference = volts ( V )
• Energy = power ✖️ Time

  E = P ✖️ t

  energy = joules ( J )

  power = watts ( W )

  Time = seconds ( s )
• Energy = charge ✖️ Potential difference

  E = Q V

  energy, joules, J

  charge, coulombs, C

  potential difference, volts, V