Content Outline

Massachusetts Science Framework Standard/s

Concepts Objective

Associated Mathematics Skills

Prerequisite skills

X. Magnetism

  A. Oersted’s

   B.Magnetic poles

   C.Magnetic fields

      1. Electron spin

      2. electron revolution

   D. magnetic domains

      1. Natural magnets

      2. Permanent magnets

  E. Electromagnets

     1. Structure

     2. Strength

     3. Superconducting electromagnets

       a. magnetic levitation

  F. Magnetic forces

    1. F= qvB

 G. Electromagnetic induction 

    1. Faraday’s Law

      a. Right hand rule

    2. Maxwell’s counterpart to Faraday’s Law

G. Technology

    1. galvanometer, ammeter, voltmeter

    2. Electric motors: brushes, armature

    3. Generators

      a. Alternating current

    4. Transformers

      a. step-up transformer

      b. Step-down transformer

5.1 Recognize the characteristics of static charge, and explain how a static charge is generated

5.2 Interpret and apply Coulomb’s law

5.3 Explain the difference in concepts between electric forces and electric fields

5.4 Develop a qualitative and quantitative understanding of current, voltage, resistance, and the connection between them.

· Explain that magnetic poles exist

· Know that like poles repel while unlike poles attract

· Describe how two kinds of electron motion contribute to magnetism

· Name common alloys that comprise magnets

· Describe how the alignment of atoms comprise magnetic domains

· Describe how permanent magnets can be weaken/destroyed

· Describe the factors that limit the strength of electromagnets

· Describe magentic levitation and its possible applications

· Explain how magnetic forces on moving charges allow electrons to be guided to produce a TV picture.

· Distinguish between galvanometers, ammeters, and voltmeters

· Explain the similarity and major differences between  galvanometers and simple electric motors.

· Explain Faraday’s Law

· Differentiate between a motor and a generator.

· Describe the transformer as a simple electromagnetic induction device.

· Be able to solve for the variables and supply appropriate units in each of the following formulae

· F = qvB

Where:

  q = charge

  v = velocity

  B = strength of magnetic field

· F~ p₁p₂/d² 

· Primary voltage/ Primary # turns =Secondary voltage/ Secondary # turns

· V_p x I_p =  V_s x I_s

   Where:

   V_p = primary voltage

   I_p =  primary current

   V_s =  secondary voltage

   I_s =  secondary current