5. Energy transfers in everyday appliances

Available for over a year

In this episode, Ellie and James explore different energy transfers in everyday appliances. They also share the key equations you need to calculate power and energy transfer. Suitable for: AQA, Edexcel, OCR. For more information on energy transfers in everyday appliances, check out the BBC Bitesize website: https://www.bbc.co.uk/bitesize/guides/z8pk3k7/revision/4 Key learning objectives discussed in this episode: - Students should be able to explain how the power transfer in any circuit device is related to the potential difference across it and the current through it, and to the energy changes over time: - power = potential difference × current - power = current 2 × resistance - 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 = power × time - energy transferred = charge flow × potential difference Students should be able to explain how the power of a circuit device is related to: - the potential difference across it and the current through it - the energy transferred over a given time. - 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.