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Electricity & Magnetism

Science, Grade 4

 
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Electric Circuits Electricity Atoms are made of three different particles, some have a positive charge, some have a negative charge, and some have no charge at all. Matter usually has the same number of positive and negative charges, making it neutral. Electricity is the flow of electrical charges. A simple circuit is a circuit in which an electric charge flows in only one path. Magnetism Magnetism is the property of attracting certain kinds of metals. The invisible field around a magnet is called a magnetic field. Magnets have two poles, a North end and a South end. Like poles repel each other while opposite poles attract; meaning the North pole on one magnet will attract the South pole on another magnet. Electromagnetism An electromagnet is a coil of wire through which an electric current passes. An electromagnet has a coil wrapped around an iron core. A parallel circuit has two or more paths the electric charge can flow through. If one bulb goes out, the other bulb will stay lit. A generator uses an electromagnet to turn mechanical energy into electrical energy by using the wind, falling water, and even steam. + - + - Static Electricity is the imbalance of positive or negative charges between objects. coils wire iron core switch current from battery + – ALKALINE B A TTER Y Objects that have the same charge will repel each other. N N S S + - + - (+) ( -) + + + + + + If two objects have opposite charges, they will pull toward each other. S N N S Magnetic North Magnetic South North Pole South Pole The Earth acts as a large magnet, with its magnetic fields being strongest at its poles; which are not exactly at the North and South Pole. A compass is a tool that has a small needle that responds to the Earth’s magnetic field by always pointing North. Magnetic Earth © Copyright NewPath Learning. All Rights Reserved. 94-4410 www.newpathlearning.com Electricity & Magnetism electron (–) proton (+) neutron (no charge)
N S Magnetic North Magnetic South North Pole South Pole What is a compass used for? ____________________ ____________________ ____________________ ____________________ Electric Circuits Electricity What is electricity? _______________________________________________ ________________________________________________________________ Describe a simple circuit. _______________________ _______________________ _______________________ _______________________ Magnetism What is magnetism? _______________________ _______________________ _______________________ _______________________ What is a magnetic field? _________________________ ________________________________________________ What are the two poles that magnets have? ________________________________________________ ________________________________________________ Electromagnetism What is an electromagnet? _________________________ _________________________________________________ Describe a use of an electromagnet. _________________________________________________ _________________________________________________ Describe a parallel circuit. _________________________ ________________________ __________________ ________________ _______________ _____________ + - What is static electricity? _________________________________ _________________________________ _________________________________ _________________________________ _________________________________ N N S S + - + - + + + + + + • attract • north pole • coil • parallel circuit • compass • positive charge • electromagnet • proton • electron • repel • generator • simple circuit • magnetic field • south pole • negative charge • static electricity • neutral Key Vocabulary Terms + – ALKALINE B A TTE R Y + - S N (+) ( -) © Copyright NewPath Learning. All Rights Reserved. 94-4410 www.newpathlearning.com Electricity & Magnetism \|xiBAHBDy01734pzY
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