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# Introduction to electricity

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### Introduction to electricity

1. 1. Introduction to Electricity<br />7SCIENCE<br />
2. 2. Electricity brainstorm<br />
3. 3. What is electricity?<br />Electricity is matter and we know all matter is made of:<br />atoms<br />Atoms are made of even smaller particles called electrons and protons<br />These have an electric charge<br />Electrons = negative<br />Protons = positive<br />
4. 4. Electric charges<br />Usually atoms have the same number of protons and electronsso the positive and negative charges are balanced<br />Sometimes atoms gain or lose an electron<br />Gain = negative (adding negative!)<br />Lose = positive (taking away negative!)<br />These electrons can move between objects and build up<br />Ex. Rubbing a balloon on your hair<br />Building up of electric charge is called static charge<br />
5. 5. Electric forces<br />Charged objects have an electric force<br />Electric force can be:<br />Attractive<br />Repulsive <br />Rule: objects with the same type of charge repel each other and those with unlike charges attract<br />ex. + and + = repel <br />ex. + and - = attract<br />
6. 6. Insulators and Conductors<br />Materials that don’t allow electrons to move easily from one surface to another is called an insulator<br />Ex. Plastic, wood, rubber<br />Materials that allow electrons to move through them easily are called conductors<br />Ex. Metal wires: copper, silver, iron<br />Why are electrical wires covered in plastic/rubber coating?<br />Do you think your body is an insulator or conductor?<br />