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 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.

2000W300W

1500W1W

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 secondSo 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.

JoulesWatts

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

xEnergy =

JEnergy =

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!!