Work

• How is "work" defined in physics?

  As the transfer of energy
• In what situation is work done according to the definition?

  When energy has been transferred
• What are the means by which energy can be transferred?

  • Mechanically: by a force acting on an object
  • Electrically: by a current moving through it
  • Thermally: by heating a hotter object to a colder one
  • By waves: such as sound or infrared waves
• What is mechanical energy transfer?

  Energy transferred by a force acting on an object
• How is electrical energy transferred?

  By a current moving through it
• What happens when a hot object transfers energy?

  It transfers energy to a colder object
• What are the different methods of energy transfer in physics?

  1. Mechanically: through forces
  2. Electrically: through currents
  3. Thermally: through heating
  4. By waves: through sound or infrared