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4th Grade Physical Science: Electricity and Magnetism

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.

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4th Grade Physical Science: Electricity and Magnetism

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  1. 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.

  2. 4th Grade Physical Science: Electricity and Magnetism • Electricity • Electrical energy can be converted to heat, light, and motion • The heat given off when something is plugged in • Flashlights • Fans

  3. 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

  4. 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

  5. 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) • Something small that floats (a piece of cork, the bottom of a Styrofoam coffee cup, a piece of plastic or a milk jug cap) • A dish, like a pie plate, 9 to 12” in diameter, with about an inch of water in it • 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.

  6. 4th Grade Physical Science: Electricity and Magnetism • 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!

  7. 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.

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