# Physics

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• Created by: Rachael
• Created on: 19-04-08 20:06

## charge and current

• The rate of flow of electrical charge is called the current.
• Metals conduct electricity as the have delocalised electrons.
• Insulators can't conduct electricity as their elctrons are held in atoms.
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## charging a conductor

• A conductor can only hold charge if it is insulated from the ground.
• To charge an insulated conductor, it needs to be brought into contact with a charged object.
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## Discharging

• To discharge an object it needs to have a conducting path to the ground, causing it to be "earthed".
• The more charge a conductor has the greater the potential difference between the conductor and ground.
• When the potential difference becomes greate enough a spark is created between the eath and the object (e.g. lightening)
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## summary

• Electrical current is the rate of flow of charge.
• A metal object cannot be charged unless it is insulated from the ground.
• You can earth and object by creating a path to the ground.
• if a metal object gains toom much charge it craetes a spark.
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