Understand that mechanical or electrical work done is equal to the energy transferred

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

Describe how energy is transferred between stores during events and processes, including examples of transfer by forces (mechanical work done), electrical currents (electrical work done), heating, and by electromagnetic, sound and other waves