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Electricity Notes – Science
Attraction and Repulsion
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If the charges are the same, they repel
If the charges are opposite, they attract
If one a charge and the other is neutral, they attract
Like charges repel
Unlike charges attract
Static electricity = when electrons jump through the air
o Caused by rubbing/creating friction
o Electric charge builds up on a surface
o If electrons have been rubbed off, the surface will be positively charged
o If electrons have been transferred to another surface, the surface will be negatively charged
Eg 1
...
The hair and balloon are then opposite charges and
causes the hair to be attracted to the balloon
...
Lightning is the result of the movement of water droplets in storm clouds which causes the
charges to separate within a cloud
...
If enough static builds up, the electrons jump from one
cloud to another or to the ground
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The Van de Graff generator is a device designed to create static electricity
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Since the charges are opposite, the
sphere creates a spark with the chamber
...

o A load – an electrical component that has resistance and converts electrical potential energy
to another form – eg
...
It is placed in the circuit so the current can pass
through it
o Voltmeter = measures the electric potential difference in volts (V)
...
Eg

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