# Unit 3 the Characteristics of Electricity ( Pg 296 ) Day 1 Electrostatics - Study of Static Electricity Neutral Objects - Materials That Do Not Carry a Charge Conductors Allow Charges (Electrons) to Flow Through Them

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Unit 3 The Characteristics of Electricity ( pg 296 )
Day 1
Electrostatics - study of static electricity
Neutral objects - materials that do not carry a charge
Conductors allow charges (electrons) to flow through them easily. E.g. metal
Therefore no matter how hard that you rub a metal tap no static charge will build up because the electrons that you are giving the tap just keep on moving up the tap and down the water line until they reach a ground.
Insulators do not allow charges to flow through them. The charge builds up on its surface eg. Faraday Cage Both a positive and a negative charge can build up on ____________________
Only ______________ can obtain a static charge.
Conductors, Insulators and in – between (pg 308)
Conductivity is the ability of materials to allow electrons to move freely in them. Materials that hold onto their electrons and do not allow them to move easily are called electrical insulators.An electrical insulator is a solid, liquid, or gas that resists or blocks the movement of electrons. Dry wood, glass, and plastic are all examples of electrical insulators. An insulator can hold a static charge because static charges remain nearly fixed in place.

Since electrons cannot move through an insulator they can be very useful to us to protect us from shocks. For example a simple electric kettle would be very hazardous if the two wires that supplied electricity to it did not have a rubber coating over them
See Table pg 308 for some common insulators and conductors. metals are good conductors since e’s can jump from one atom to the next rubber and plastics are insulators since they hold their e’s tightly
Why do you get more shocks in the winter than in the summer?

This is because in winter the air is far dryer than in the summer and dry air is an insulator and therefore does not take any of the charges our body might pick up during the day. So when we go and touch another conductor (a door handle) ZAP we receive

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