# 4th Grade Physical Science: Electricity and Magnetism  Electricity How to design and build a series and parallel circuit A series circuit only has one.

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4th Grade Physical Science: Electricity and Magnetism  Electricity How to design and build a series and parallel circuit A series circuit only has one path for moving charges; when the path is broken, the energy can’t flow. A parallel circuit has two or more paths for moving charges.

 Electricity Electrical energy can be converted to heat, light, and motion  The heat given off when something is plugged in  Flashlights  Fans 4th Grade Physical Science: Electricity and Magnetism

 Electricity Electrically charged objects attract or repel each other  2 balloons rubbed with a piece of wool will have the same (like) electrical charge.  The balloons will move away from each other because like charges repel each other 4th Grade Physical Science: Electricity and Magnetism

Magnetism  The space near a magnet where magnetic forces act is called the magnetic field  Magnets have opposite poles at each end, and unlike poles attract; like poles repel 4th Grade Physical Science: Electricity and Magnetism

 Magnetism: How to create a simple compass and how to use it. A needle or some other wire- like piece of steel (a straight paper clip, for example)steel Something small that floats (a piece of cork, the bottom of a Styrofoam coffee cup, a piece of plastic or a milk jug cap)coffee A dish, like a pie plate, 9 to 12” in diameter, with about an inch of water in it 4th Grade Physical Science: Electricity and Magnetism The first step is to turn the needle into a magnet. The easiest way to do this is with another magnet -- stroke the magnet along the needle 10 or 20 times.

 Magnetism: Place your float in the middle of your dish of water as shown below. The "float on water" technique is an easy way to create a nearly frictionless bearing. Center your magnetic needle on the float. It very slowly will point toward north. You have created a compass!bearing 4th Grade Physical Science: Electricity and Magnetism

 Magnetism: Electromagnetism  Wires carrying an electric current become magnets.  An electromagnet is a core wrapped with wires that carry current.  The ends of the electromagnet are magnetic only when there is current in the wire.  Generators use electromagnets to produce current (electricity) from motion.  Motors use electromagnets to convert electricity to motion. 4th Grade Physical Science: Electricity and Magnetism

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