Transcript Storyboard no. #1 Module: Author: Date: Description

It’s Electric!
Magnetic and Electric Investigations
Magnetic and Electric Investigations
Objectives:
Magnets:
Identify different types of magnets.
Define magnetic poles.
Describe the interaction of like and unlike magnetic poles.
Define magnetic fields
Identify the magnetic properties of Earth
Describe the relationship between electric current and a magnetic field
Recognize the presence of magnets or magnetic interactions
Electricity:
Identify the characteristics of an electric circuit
Describe a series circuit
Describe a parallel circuit
Correctly identify electrical symbols
Magnetism and Electricity in Our Lives:
Describe the relationship between electric current and a magnetic field
Identify safety devices used to protect people from common electrical hazards
How much do you know?
Click here to play the magnetic
and electric circuit challenge.
Types of Magnets
U-shaped or horseshoe
Bar
Ferrite disc and rectangular
Neodymium disc
*strongest magnet
Magnetic Poles
-All magnets, no matter what shape, have two ends.
-Each end of the magnet is called a magnetic pole.
-The magnetic effect is strongest at each pole.
- One pole is labeled north pole and the other one is
labeled south pole.
-Like poles repel (push away) and unlike poles attract
(move towards each other).
Magnetism Factsheet
Magnetic Field
-The magnetic field is known as the area of
magnetic force surrounding the magnet.
-The magnetic field allows the magnet to interact
with other magnets without touching.
-Magnet field lines spread from one pole to the
other pole.
-Earth has a strong magnetic field surrounding it.
-The poles of the magnetized needle of a
compass align themselves with Earth’s magnetic
field.
Electric Circuit Characteristics
-A circuit should have a source of electrical energy (such as a
battery).
-A circuit should have devices that are powered by electrical
energy to perform a function (such as bulb or motor).
-A circuit should be connected by conducting wires (and a
switch).
-The direction of current determines the direction of the
magnetic field.
-Current flows only through electric circuits.
Electrical Symbols
Bulb
Cell (e.g. one
cell battery)
A
Ammeter
Wire
M
Switch
Motor
Series Circuits
-A series circuit has only one path
for the current to follow.
-Light bulbs in a series circuit
become more dimmer as the
number of light bulbs is increased.
Series
-If one light goes out, the other
lights in a series circuit will go out.
Parallel Circuits
-A parallel circuit has several
paths for the current to follow.
-Light bulbs in a parallel circuit do
not become more dimmer as the
number of light bulbs increases.
-If one light goes out the other
lights in a parallel circuit will
remain lit.
Electricity Factsheet
Electrical Safety
Grounding
-Additional grounding wires can protect people from
shocks.
-Using a plug with a third prong allows the connection of
the appliance to the ground wire of the building.
-A circuit is considered grounded when charges are able
to flow directly from the circuit to a ground connection in
the event of a short circuit.
Electrical Safety (continued)
Fuses and Circuit Breakers
-A fuse is a device with a thin strip of metal that melts if too
much current flows through it.
-The “melting” occurs or the circuit “blows” when the current
flow is stopped.
-When the overload is corrected, the fuse is replaced, and
the electricity flows once again.
-A circuit breaker uses an electromagnet to shut off the
circuit if the current flow is too high.
Quiz Time!
Click on the clipboard to log-in to Quia Web. You will need
to enter it’s electric quiz in the Quiz Sessions box.
Note: You must be enrolled in the class to complete the quiz. The
quiz name is case sensitive.
You have been magnetized and electrified!