E5: Efficiency — C level

You might have noticed energy star labels on electrical things in your home. They look like this:

These labels help people choose which product to buy. But do you know what they mean?

Find out about energy stars on the official energy star website.

Questions:

1. What do the stars on the label tell you about the efficiency of the product?
2. Can you compare the star rating of a big fridge and a small fridge?
3. How do they work out the energy consumption?
4. If you buy a TV that says it uses 261kWh of energy each year, will it use 261kWh of energy in your home? Explain your answer.
5. If you buy the TV that says it uses 261kWh of energy each year, how much will it cost to use if the electricity price is 40 cents per kWh?