Activities/Turtle Art/Using Turtle Art Sensors: Difference between revisions
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Small amounts of salt are added to tank water, bringing the resistance down from 5k ohms to 2k ohms. Salt added on two occasions | Small amounts of salt are added to tank water, bringing the resistance down from 5k ohms to 2k ohms. Salt added on two occasions | ||
==Generating Electricity from a Changing Magnetic Field== | |||
Requires a refrigerator magnet, often given away free with advertising on it. | |||
Wrap 50 turns of insulated wire onto a nail and connect the two ends to a phono plug as shown (if it is a stereo plug, probably the red wire and the copper shield). Connect the phono plug to the microphone input. Graph the Sound or Volume block. | |||
* Wipe the sharp end rapidly over the back of the fridge magnet, try both directions. | |||
* Try a different number of turns of wire | |||
* Try moving the nail more slowly, what happens? | |||
* What is happening? | |||
* Why does it work better on one axis of the magnet? (hint rub 2 magnets together) | |||
==Links== | ==Links== | ||