equations

• reisstance equation 


  R = V/I
• resistance equation


  R = V/I
• power equations


  p = W/t (power = work done / time)

  p = V x I (power = potential difference x current)

  p = I (squared) x R (power = current squared x resistance)
• power equations


  efficiency = useful output / total input x 100

  w = Int (work done = current x PD x time)

  w = QV (work done = charge x PD)

  PD = energy / charge