3.2 Magnetic effect of electric current

• explain magnetization and demagnetization using domain theory of magnetism
• investigate the magnetic effect of a current flowing through a conductor
• describe the working of an electromagnet
• describe the direction of force produced on a current carrying conductor in a magnetic field
• explain applications
• appreciate the applications of magnetic effect of electric current in day-to-day life

“How does a motor work?”

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1. Magnets and domain theory
   40 min · 1 practice tasks · quiz
   Explain magnetism and magnetisation using the domain theory.
2. Magnetisation and demagnetisation
   40 min · 1 practice tasks · quiz
   Describe methods of magnetising and demagnetising materials.
3. Magnetic field due to a current
   40 min · 1 practice tasks · quiz
   Describe the magnetic field produced by a current-carrying conductor.
4. Magnetic field patterns of coils
   40 min · 1 practice tasks · quiz
   Describe the magnetic field of a coil and a solenoid.
5. Electromagnets
   40 min · 1 practice tasks · quiz
   Describe the working of an electromagnet.
6. Strength of an electromagnet
   40 min · 1 practice tasks · quiz
   Describe the factors that affect the strength of an electromagnet.
7. Making an electromagnet
   40 min · 1 practice tasks · quiz
   Construct a working electromagnet using locally available materials.
8. The force on a current-carrying conductor
   40 min · 1 practice tasks · quiz
   Describe the force on a current-carrying conductor in a magnetic field.
9. Motor effect calculations
   40 min · 1 practice tasks · quiz
   Solve problems on the force on a current-carrying conductor.
10. The electric motor
    40 min · 1 practice tasks · quiz
    Describe how an electric motor works.
11. The electric bell and the relay
    40 min · 1 practice tasks · quiz
    Describe the working of the electric bell and the relay.
12. Meters, loudspeakers and microphones
    40 min · 1 practice tasks · quiz
    Describe applications of the magnetic effect in meters and sound devices.
13. Circuit breakers and the vehicle alternator
    40 min · 1 practice tasks · quiz
    Describe more applications of the magnetic effect of a current.
14. Review of the magnetic effect of a current
    40 min · 1 practice tasks · quiz
    Review magnetism, electromagnets, the motor effect and their applications.