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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- 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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- 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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