Define power as work done per unit time and also as energy transferred per unit time; recall and use the equations (a) power = work done / time taken, P = W/t (b) power = energy transferred / time taken, P = ΔE/t

Recall and use the equation work done = force × distance moved in the direction of the force, W = Fd

Describe the operation of an electric motor, including the action of a split-ring commutator and brushes