Presentation on theme: "BTEC Unit 5 Energy and Power Interactive. Instructions Click on the arrows to move from page to page Open the word document, Energy and Power When you."— Presentation transcript:
Instructions Click on the arrows to move from page to page Open the word document, Energy and Power When you see the word icon go to the document and type in your answers to the questions it asks.
Every time you turn on an electrical device it uses energy. Using electrical energy
The electricity meter measures how much energy you have used at home. Your bill, of course, depends on what you switch on; how long its on for.
2000W 300W 1500W 1W Which device uses the most energy in one second? least most click to check your answer.
What does 300W mean? You see labels like this on electrical devices at home. The power tells you how much energy the device uses in one second. W stands for watts. The number is the power of the device.
1 Watt = 1 Joule of energy per second So a 9W light bulb has a power of 9W. It uses 9 Joules of energy each second when it is switched on.
Energy = Power x time Calculating energy used. We can use a formula to see how to work out how much energy is used. Joules Watts seconds click to see units
How much energy does a 9W light bulb use when it is on for 30 seconds? Energy = Power x Time Energy = 9 x 30 Energy = 270 J Always write down the formula Then put the numbers instead of the words Now calculate the answer Click on each box to reveal the answer
x Energy = J Energy = Power x Time Use this calculator by typing the correct numbers in the boxes.
http://www.sciencemuseum.org.uk/onlinestuff/games/hungy_mice.aspx Click on the link below to play the hungry mice game. Well done, you have earned some game time!!