Physics (Combined Science) · GCSE · AQA · AQA GCSE Combined Science: Trilogy (8464) — Physics — Foundation · Specification point · 6.2.4.2 · Electricity · Energy transfers
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6.2.4.2 Energy transfers in everyday appliances
| Content | Key opportunities for skills development |
|---|---|
Everyday electrical appliances are designed to bring about energy transfers. The amount of energy an appliance transfers depends on how long the appliance is switched on for and the power of the appliance. Students should be able to describe how different domestic appliances transfer energy from batteries or ac mains to the kinetic energy of electric motors or the energy of heating devices. Work is done when charge flows in a circuit. The amount of energy transferred by electrical work can be calculated using the equation: | |
energy transferred, E, in joules, J
power, P, in watts, W
time, t, in seconds, s
charge flow, Q, in coulombs, C
potential difference, V, in volts, V
MS 3b, c Students should be able to recall and apply both equations. WS 1.4 |
Students should be able to explain how the power of a circuit device is related to:
Students should be able to describe, with examples, the relationship between the power ratings for domestic electrical appliances and the changes in stored energy when they are in use. | WS 1.2 |