The document discusses factors to consider when choosing household appliances like TVs, washing machines, and fridges. It explains that all appliances have European energy labels that show efficiency ratings, and people were initially shocked by these labels. It also discusses how reducing energy transferred as movement and sound or reducing water use for washing can lower electricity usage. Sankey diagrams are introduced as a way to show how energy transfers within machines.

1. 7.4 Electric Lives January 4, 2011 You are buying a new TV, washing machine and fridge. What are the most important factors to consider when choosing these household appliances?

5. Mains supply Washing machine Water Drum Surroundings Case heat movement movement sound electrical QUESTION: why could cutting down on the energy transferred as movement and sound reduce the amount of energy used?

6. Mains supply Washing machine Water Drum Surroundings Case heat movement movement sound electrical QUESTION: would reducing the amount of water used for washing reduce the amount of electricity used?