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4th Grade Physical Science: Electricity and Magnetism

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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 ... – PowerPoint PPT presentation

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Title: 4th Grade Physical Science: Electricity and Magnetism


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
    cant 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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