updated: Aug 2006

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Unit 5: Electromagnetism

This unit looks at the combination of electricity and magnetism. It is amazing how much our technology depends on electromagnetism - not just electricity or just magnetism. We will look at electromagnets, motors, generators, and transformers.


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Pages in Text


1. Magnetism, Domain Theory, Magnetic fields
Activity: field lines


p476: Summarize the seven effects of the domain theory
p478 #1,3,6 (top)
2. Magnetic fields around conductors
Right Hand Rule #1 = fields around conductors
Right hand rule #2 = field in coils
479-485 p481#1-3, p482#1,2,4 p483#1,2, p488#4-7 p489#1-8
3. Quiz.
Electromagnets, Applications
Magnetic permeability, Magnetic field calculations
Activity: make an electromagnet
4. How a DC Motor worksDC Motor ISP project 496-499 p498 #1-4
5. Electromotive Force or Motor Principle
Right Hand rule #3
490-495 p 493#1,2
p504 #4-7, 9, 10
6. Electromagnetic induction, Faradayís Law,
Lenzís law (generators)
p512#4,5 p517#1,2 (bottom) Read p518Ė522 p522#1-5
7. Transformers 523-529 p 528 #1-4 (top or bottom?)
8. Power transmission, eddy currents 529-532 p 535 #1,2,6-8
10. Review    
12. D.C. Motor Testing -- before the last day of classes (if this is the last unit)

Extra Resources:



Physics1: Electromagnetism Objectives (or Outcomes)

By the end of this unit the student will be able to:

define and describe the concepts and units related to magnetism and electromagnetism (e.g. magnetic field, electromagnetic induction)
describe the properties of magnetic fields
use compasses and iron filings to locate and draw magnetic fields
describe, illustrate, and determine the direction of the magnetic field produced by (a) a long straight conductor, (b) a solenoid
build an electromagnet, investigate the factors that influence its strength
calculate the magnitude and direction of magnetic fields of a straight wire and a solenoid
use superposition to determine the magnetic field produced by two long wires
calculate the force of attraction of repulsion between two long current-carrying wires
state the motor principle (electromotive force) and what the requirements are for it to occur
use a right hand rule to determine the direction of the electromotive force
state Faradayís law of electromagnetic induction
state Lenzís law and explain the reasoning behind it
use Lenzís law to determine the direction of induced current
calculate the magnitude and direction of the force experienced by a moving charged particle in a magnetic field (q, v, B) and explain why the magnetic force can do no work
determine the direction and magnitude of the force on a current carrying wire in a magnetic field
deduce the direction of the magnetic field from the motion of a charged particle in that field
draw a diagram of a simple transformer, labeling the parts
explain how a transformer works
use the transformer equations for voltage and current to solve problems
explain why power transmission is generally AC
compare direct current (DC) and alternating current (AC) in qualitative terms, and explain the importance of alternating current in the transmission of electrical energy;
identify the parts of a DC motor and explain how it works
state 5 ways to make a motor work better
build a model of one of these devices that operates using the principles of electromagnetism (e.g. electric bell, loudspeaker, ammeter, electric motor, electric generator).
explain how the devices above work
"analyse and describe the operation of industrial and domestic technological systems based on principles related to magnetic fields (e.g., electric motors, electric generators, components in home entertainment systems, computers, doorbells, telephones, credit cards) "
"describe the historical development of technologies related to magnetic fields (e.g., electric motors and generators, cathode ray [TV] tubes, medical equipment, loudspeakers, magnetic information storage). "
explain the principles of domain theory of magnetism
use the domain theory to explain observations about magnets
use power loss equation to determine the power lost in transmission lines
explain the origin of eddy currents, where they are useful, where they are detrimental to the operation of electromagnetic devices, and how eddy currents can be minimized.

Ministry of Education requirement
AP Physics requirement
Teacher's extra requirement

Last updated: May 2011