If you’ve ever received a shock from touching a door handle after walking over a carpet, then you’ve already had first hand experience of static electricity.
Unfortunately, a lot of experiments that are designed to produce static electricity don’t seem to work very well. However, if you follow the instructions closely, today’s experiment is guaranteed to work.
What you will need: a styrofoam plate, a styrofoam cup, an aluminum tray, some glue and a wool sock.
Step 1: Put some glue on the rim of the cup then stick it to the aluminum tray.
Step 2: Rub the sock on the styrofoam plate for at least a minute. The longer you rub it, the more likely it is that the experiment will work.
Step 3: Using the cup, pick up the tray and put it on the styrofoam plate. Touch the tray. When you touch it you will get a small shock.
方法 If everything worked well, the aluminum tray should be charged. Move it towards other objects and you will notice that it emits a spark when it gets close. There should be enough static in the tray to discharge quite a few sparks.
WHY IT WORKS
When you rubbed the styrofoam plate in step two you gave it a negative charge. Then when you put the aluminum tray on the plate, the electrons in the styrofoam repelled the electrons in the tray. Because the tray is surrounded by styrofoam and air, it retains a negative charge. By touching the tray in step three, you gave it a positive charge.
Because the tray has a positive charge, it attracts electrons whenever it goes near another object. This attraction is what causes the spark.
(John phillips, staff writer)
1. shock n.
電擊 (dian4 ji2)
2. tray n.
托盤 (tuo1 pan2)
3. rub v.i./v.t.
摩擦 (mo2 ca1)
4. spark n.
電火花 (dian4 huo3 hua1)
5. electron n.
電子 (dian4 zi3)
6. object n.
物體 (wu4 ti3)
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