Conversion of Energy

Cards (10)

  • 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.
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