tle quiz

• What is an electromagnetic field?


  A classical field produced by moving electric charges
• What are electromagnetic waves?


  Waves created as a result of vibrations between an electric field and a magnetic field
• What does the branch of electromagnetism study?


  The interaction between electric fields and magnetic fields
• What is electrodynamics?


  The study of phenomena associated with charged bodies in motion and varying electric and magnetic fields
• What is the magnetic force?


  The force that acts between two magnetic objects, capable of both pulling and pushing
• How do different poles of a magnet interact?


  Different poles pull each other, while the same poles push each other
• What are some applications of electromagnetism?


  • Electric Motors: Convert electrical energy into mechanical energy
  • Transformers: Transfer electrical energy between circuits
  • Communication Technologies: Use electromagnetic waves for broadcasting and communication
• How do electric motors utilize electromagnetism?


  They convert electrical energy into mechanical energy using the interaction of electric currents and magnetic fields
• What is the function of transformers in electromagnetism?


  They transfer electrical energy between circuits using electromagnetic induction
• What types of waves are used in communication technologies?

  Electromagnetic waves such as radio waves and microwaves
• What materials are typically used to create a braid?


  Elastic materials such as textile yarns and switches
• What is a coaxial cable?


  A cable with an internal conductor enclosed by a tubular dielectric insulator
• What are the components of a coaxial cable?


  An internal conductor, a tubular dielectric insulator, a metallic shield, and an outer plastic jacket
• What is an intercom?


  A short-term internal communication system installed for communication within a building or school
• What is polyethylene?


  A synthetic polymer of ethylene used in manufacturing plastic containers and electric insulation
• What is the purpose of a sheath in electrical wiring?


  To serve as an outer covering for solid and stranded wires or conductors
• What are thermoplastic materials?


  Insulating materials typically made from plastic polymers used as insulators for electrical wires and cables
• What are the two main purposes of wires and cables?


  • Carry electric power from one place to another
  • Carry information-bearing signals from one place to another
• What is a cable composed of?


  Two or more fine wires sequenced side by side and tied, twisted, or enclosed as one.
• What does a wire consist of?


  A single strand or a group of strands of electrically conductive materials.
• What materials are commonly used to make wires?

  Aluminum or copper.
• How can wires be presented?

  Wires could be bare or enclosed in protective color-coded insulators.
• What are the two main purposes of wires and cables?


  To carry electric power and information-bearing signals from one place to another.
• What is a solid wire?


  A long length of a single conductor offering low resistance.
• Why is solid wire perfect for use in higher frequency applications?


  Because it offers low resistance.
• What is a stranded wire?


  A wire that contains many thin strands of wires twisted together.
• What is the advantage of stranded wire over solid wire?


  Stranded wire has a longer life due to its flexibility.
• What is a cord typically used for?


  It is generally used in appliances or electrical devices.
• What types of wires can a cord be?


  A cord can be duplex or triplex wire.
• Where can heat, moisture-resistant, and flame retardant cables be utilized?


  For the installation of wiring in dry and damp locations in buildings.
• What is thermoplastic wire used for?


  For the installation of wiring in dry and damp locations in buildings.
• What is the purpose of copper or aluminum polyethylene-insulated wire?


  It is used for primary distribution lines and can withstand any weather conditions.
• What are copper or aluminum conductors used for?


  They are used for overhead transmission lines and ground wires without insulation.
• What is thermoplastic-covered fixture wire used for?


  For wiring lighting fixtures such as in fluorescent lamps assembly and as terminal wires.
• What is non-metallic-sheathed cable (type NM) used for?


  For exposed or concealed wiring installations in buildings.
• What is flat cord generally used for?


  As an appliance cord for portable electric apparatus and for extension cords.