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"Static Electricity Phenomena in Life" Electric PPT
Part 1: Experience the phenomenon of static electricity
1. Hold a plastic comb close to the shredded paper and observe the phenomenon.
2. Comb the hair a few times, then approach the scraps of paper and observe the phenomenon.
3. Put the comb that has just been used to comb your hair close to your hair and observe the phenomenon.
Static electricity can be seen everywhere in life. Talk about the electrostatic phenomenon you know.
Static electricity is present in everything around us, living and non-living things including humans.
Static electricity phenomenon in life PPT, part 2: different charges
Since static electricity exists in all materials, why don't we usually feel that objects are charged?
It turns out that matter has two kinds of charges at the same time: positive charge and negative charge. Since the positive and negative charges are equal in number and cancel each other out, the object does not appear to be charged. When an object is affected by external influences (such as friction), the charge on the surface of the object is transferred, and the number of positive and negative charges is different, and the object becomes charged.
When we use a plastic comb to comb dry hair, the comb is negatively charged and the hair is positively charged, and they attract each other when they are close.
Experiment 1: Use a piece of wool to repeatedly rub one side of the inflated balloon and bring the side of the balloon close to your hair. Observe what happens?
Experiment 2: Hang two inflated balloons next to each other on a wooden ruler about 1 meter long. Use wool products to rub the parts where the two balloons are in contact with each other. Observe what happens?
Static electricity phenomenon in life PPT, part 3: Let the charge flow
Friction transfers charge from one object to another, causing objects to become electrostatically charged. But in a statically charged object, the charge cannot flow continuously. In order for charges to flow to form an electric current, two conditions need to be met:
① There must be power, that is, power supply;
② There must be a circuit - current can only flow in a circuit.
A circuit is a current path connected by a power supply, electrical appliances, wires, electrical components, etc.
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