Conversion of 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 ideally transferred usefully, but some is dissipated as wasted energy.
• What is the common form of wasted energy when using a phone?

  Heat energy.
• What defines an open system in physics?

  An open system allows energy and matter to move freely between the system and the environment.
• In the phone example, what is considered the system and the environment?

  The phone is the system, and everything else in the universe is the environment.
• What happens to heat energy when a phone is placed in a sealed jar?

  The heat energy dissipates to the air inside the jar and stays within the closed system.
• How does the overall energy of a closed system behave?

  The overall energy of a closed system doesn't ever change.
• What should you do if you enjoyed the video?

  • Give a like
  • Subscribe to the channel