P2 - static electricity

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  • Created by: ldupre03
  • Created on: 29-04-17 10:58
Decide the composition of an atom.
a nucleus containing protons and neutrons, and shells outside on which electrons move around. There are the same number of protons and electrons, so the + and - charges balance equally no charge.
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what are the relative charges and mass's of protons, neutrons and electrons?
protons= C of +1, M of 1. neutrons= C of 0, M of 1. electrons= C of -1, M of 0
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what is produced when two insulating materials are rubbed together?
An electrostatic charge
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what part of the atom is transferred from one material to the other
electrons
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the material that has gained electrons will now have a positive or negative charge?
negative charge
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the material that has lost electrons will now have what kind of charge?
a positive charge (equal in size to the negative charge)
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a charged object can attract uncharged objects. why is this?
because a charged object induces a charge in the uncharged object
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you can sometimes build up a charge of what as you move around?
static electricity
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if you then touch a door or other object, you may feel a shock. why?
because the electrons will move to 'cancel out' the charge on you, this is called earthing. The movement of the electrons causes a slight shock.
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why does lightening happen?
because of a charge of static electricity built up in the clouds when they rub together. Once the charge is big enough, charged particles can flow through the air. this energy is released causes light and sound. (can damage living things & buildings
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what is static electricity useful in?
paint spraying and insecticide sprayers
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describe the use of static electricity in insecticide sprayers
nozzle connected to electricity supply, droplets all get same kind of static charge, droplets repel each other so the spray spreads out evenly.
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describe the use of static electricity in paint sprayers
nozzle connected to electricity supply, droplets all get same kind of static charge so they spread out evenly, object being painted is given opposite charge to paint, paint is attracted to object and less paint is wasted
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what is a danger of static electricity
can build up on an aeroplane as it flies. when plane is refuelled the charge may cause a spark when the nozzle touches the aeroplane. could cause an explosion if it ignited fuel vapour
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how do we deal with this danger?
a conducting wire called a bonding line - used to earth any static charge on plane before refuelling. Electrons can move along the wire to earth to neutralise it.
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Other cards in this set

Card 2

Front

what are the relative charges and mass's of protons, neutrons and electrons?

Back

protons= C of +1, M of 1. neutrons= C of 0, M of 1. electrons= C of -1, M of 0

Card 3

Front

what is produced when two insulating materials are rubbed together?

Back

Preview of the front of card 3

Card 4

Front

what part of the atom is transferred from one material to the other

Back

Preview of the front of card 4

Card 5

Front

the material that has gained electrons will now have a positive or negative charge?

Back

Preview of the front of card 5
View more cards

Comments

ldupre03

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number one is meant to say 'describe...' not decide

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