Understand that everyday electrical appliances are designed to facilitate energy transfers.
Describe how the total amount of energy transferred by an appliance depends on its power rating and the duration for which it is switched on.
Explain how various domestic appliances transfer energy from batteries or ac mains to different energy stores, such as the kinetic energy of electric motors or the thermal energy of heating devices.
Understand that work is done when electrical charge flows in a circuit.
Recall and apply the equation to calculate the energy transferred by electrical work using power and time:
E=Pt
Recall and apply the equation to calculate the energy transferred using charge flow and potential difference:
Explain the relationship between the power of a circuit device, the potential difference across it, the current through it, and the energy transferred over a specified time.
Describe the relationship between the power ratings of domestic electrical appliances and the changes in stored energy when they are operational, providing relevant examples.
