4th Grade Physical Science: Electricity and Magnetism - PowerPoint PPT Presentation

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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

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.