Transferring Energy

• What is the conservation of energy principle?

  Energy can be transferred, stored, or dissipated but can never be created or destroyed.
• Why can't we create new energy according to the conservation of energy principle?

  Because energy can only move between different objects and forms.
• How does charging a phone illustrate the conservation of energy principle?

  • Electrical energy from the wall is transferred to the phone's battery.
  • Chemical energy in the battery is converted back to electrical energy when used.
  • Electrical energy powers the screen (light energy) and speaker (sound energy).
• What happens to energy when it is transferred in a phone?

  Some energy is dissipated as wasted energy, often in the form of heat.
• What is the common form of wasted energy when using a phone?

  Heat energy.
• What is a system in physics?

  • A portion of the physical universe chosen for analysis.
  • Everything outside the system is known as the environment.
• In the phone example, what is considered the system?

  The phone itself.
• What defines an open system in physics?

  Energy and matter can freely move between the system and the environment.
• Why is a phone considered an open system when in use?

  Because it exchanges heat energy with the surroundings.
• What is a closed system in physics?

  • A system where energy and matter cannot enter or escape.
  • The overall energy of a closed system does not change.
• What happens to heat energy in a closed system when a phone heats up?

  The heat energy is dissipated to the air inside the jar and stays within the system.
• What is the overall energy change in a closed system?

  The overall energy does not change.
• What should you do if you enjoyed the video?

  You should give a like and subscribe.