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16 Cards in this Set
- Front
- Back
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What is static electricity
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Charges that are not free to move. They build up in one place and often end with spark or shock
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What are electrical conductors?
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Conductors are materials that condict charge easilly like metals copper and silver
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What are electrical insulators?
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Stuff that doesn't condict charge very well like plastic and rubber
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What are the tiny particles that make up materials called
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atoms
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What's in the nucleus of an atom?
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+ charged protons and neutrons
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What orbits the nucleus?
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electrons
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Why are some materials good conductors
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Their atoms are held loosely to atom and can move around freely. These materials let electrons flow through them easily. e.g. metals
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Whya re some materials poor conductors
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Their atoms are held firmly to the atom and cannot move around freely. They are good insulators. Rubber, glass, air, plastics.
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How is static built up?
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By friction
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Describe how static electricity is created
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1. Two insulating materials rubbed together
2. electrons scraped off and dumped on another 3. one has positive charge other negative (depends on materials) |
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What happens with polythene rod and duster?
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electrons move from duster to rod. rod negative, duster positive. Equal charge.
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What happens with acetate rod?
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electrons from rod to duster. duster negative, rod positive. equal charge.
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Do positive charges move?
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NOOO!! Only electrons move. +ve and -ve are caused by movement of electrons. For a positive static charge the electrons have moved off to another surface!
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How can a charged conductor be discharged safely?
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connecting it to earth with a metal strap. if negative then electrons flow down strap to ground, if positive then up strap.
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What is the rate of flow of electrical charge called?
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Current!!
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What happens when a charge builds up in an isolated object?
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So does the voltage. If voltage gets big enough then spark jumps across the gap
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