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A compass needle points North because the Earth has a magnetic force that attracts the metal in the needle. Bob Symes shows what happens to the compass needle if a wire with an electric current is placed next to the compass. He proves that this principle works backwards as well as forwards; electricity can be generated by pushing a magnet through a wire coil. (7 minutes)



 
    

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Part of the Series : The Way Things Work
     


Only available in the US and Canada.




How Levers Work

A thin ruler can lift a heavy paint can. How? Watch Bob Symes demonstrate the power of the lever, how it works, and how moving the position of the fulcrum changes its ability to work. (5 minutes)(more details)
 
How Batteries Work

Although batteries may look complicated, they are as simple as lemons. Bob Symes uses this fruit as the source of electrolytes-a basic component of all batteries. He attaches two dissimilar metal rods (one zinc, one copper) to a lemon and then measur...(more details)
 
How Gears Work

Bob Symes demystifies the subject of gears. He explains how thinking about gears as "round wedges" reveals why a large gear wheel spins slowly but produces a lot of power, while a small gear wheel spins quickly but produces little power. (8 minutes)(more details)
 
How Light Changes Color

What produces color, and why does a color look different when viewed through lenses of different colors? Bob Symes investigates the mysteries of color with several simple experiments. By spinning a disk that has been painted with equal segments of bl...(more details)
 
What Is a Wedge?

We are surrounded by wedges that help us every day-ramps, staircases, knife blades. Wedges exert force in two directions: forward and up. Bob Symes demonstrates the difference in action between a thin wedge (it travels a long way forward to achieve a...(more details)
 


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