what makes the world go 'round...

Energy is often defined as "the ability to do work," and Energy makes the world go around, you might say.

Let's use the definition that energy is "that which can change the motion, physical composition or temperature of an object." And let's define power as "the flow of energy, from one form to another, over time." Does your everyday understanding of energy fit these definitions?

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Understanding the amount of energy needed for various activities and how energy is transformed from one state to another helps us produce, use and save energy more efficiently. The unit of energy with which you are probably most familiar is the calorie. First, please look at the definition of a calorie. Now look at how much energy is needed to do various things with with 1 gram of water.

There are many different states of energy: nuclear energy, chemical energy, potential and kinetic energy, to name a few.

Here's an experiment on stored energy you can do at home or at school (A Hands-On Activity). If you don't have time to do this yourself, here's some results.

How much energy does it take to increase the temperature of more than one gram of water? Explore that question here with the boiling water experiment. [shockwave & flash required]


* What is the vast scale of energy??

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