7.1.2 Electromagnetism

• Electromagnetism is the phenomenon where electric currents produce magnetic fields around them.fields
• Electromagnets are used in motors to convert electrical energy into mechanical energy
• Match the magnetic field source with its need for electricity:

  Electromagnet ↔️ Yes

  Permanent Magnet ↔️ No
• The magnetic field around a straight wire circles the wire in three dimensions.


  True
• Electromagnetism is the interaction between electricity and magnetism.


  True
• The motion of electric charges generates magnetic fields in electromagnetism.


  True
• What is the source of the magnetic field in a permanent magnet?

  Atomic structure
• Permanent magnets require electricity to generate their magnetic fields.

  False
• Why does an electric current create a magnetic field around a conductor?

  Motion of electric charges
• Increasing the electric current in a conductor increases the strength of the magnetic field
• Increasing the number of turns in a coil increases the strength of the magnetic field
• Understanding the factors affecting magnetic field strength is crucial for designing effective electromagnetic devices
• What type of energy do generators convert into electrical energy?

  Mechanical energy
• Match the applications of electromagnetism with their descriptions:

  Electromagnets ↔️ Generate temporary magnetic fields

  Generators ↔️ Convert mechanical energy to electrical energy

  Transformers ↔️ Change voltage levels in circuits
• Electromagnetism involves the creation of magnetic fields by electric currents.

  True
• Match the concept with its description:

  Electromagnetism ↔️ Magnetic fields created by electric currents

  Permanent Magnet ↔️ Fixed magnetic fields
• Permanent magnets have fixed magnetic fields due to the alignment of their atomic structure
• Magnetic fields created by an electric current are caused by the motion of electric charges
• The right-hand grip rule helps visualize how an electric current creates a magnetic field
• When an electric current flows through a conductor, it creates a magnetic field
• What is the source of the magnetic field in an electromagnet?

  Electric current
• Electromagnets have temporary magnetic fields that can be switched on and off.


  True
• When an electric current flows through a conductor, it creates a magnetic field around it due to the phenomenon called electromagnetism
• The right-hand grip rule is used to determine the direction of the magnetic field around a current-carrying wire.


  True
• Increasing the distance from a current-carrying conductor decreases the strength of the magnetic field
• In which devices are electromagnets used to convert electrical and mechanical energy?

  Motors, generators, transformers
• What type of induction is used in transformers to change voltage levels?

  Electromagnetic induction