10.8 Conservation of Electric Energy

• The SI unit of electric energy is the joule (J).


  True
• Thermal energy in a circuit is generated by heat.
• Electric potential and electric energy are directly related.


  True
• In electric circuits, energy is transferred from high voltage to low voltage.


  True
• What is electric energy related to in terms of electric fields?

  Potential difference
• In electric systems, the total energy remains constant
• What is electric energy defined as?

  Energy due to position
• What happens to potential energy as a charged particle moves towards an opposite charge?

  Converts to kinetic energy
• What happens to kinetic energy as potential energy decreases in an electric field?

  Increases
• How much energy is transferred in a circuit with 12V, 3A, and 5s?

  180 J
• In electric systems, energy is only transformed, not lost or gained.


  True
• What is the source of potential energy in an electric system?

  Position in electric field
• Electric potential at a point is directly related to the electric energy of a charged particle
• The formula to calculate energy transferred in a circuit is E = V × I × t
• Match the component with its function and example:

  Energy Source ↔️ Provides electric energy (Battery)

  Energy Consumer ↔️ Performs work using energy (Bulb)

  Conductor ↔️ Facilitates energy transfer (Wire)

  Switch ↔️ Controls energy flow (Light switch)
• Match the form of energy with its source:

  Potential Energy ↔️ Position in electric field

  Kinetic Energy ↔️ Movement of charge carriers
• In electric systems, the total energy remains constant.


  True
• Potential energy is the energy a charged particle possesses due to its position.
• The energy transferred in a circuit can be calculated using the formula E = V \times I \times t.
• Order the energy forms in an electric field from potential to kinetic.

  1️⃣ Potential Energy

  2️⃣ Kinetic Energy
• Potential energy can convert into kinetic energy and vice versa in electric systems.

  True
• Sequence the energy conversion as a charged particle moves in an electric field:

  1️⃣ Potential energy decreases

  2️⃣ Kinetic energy increases
• What happens to potential energy when a charge moves from high voltage to low voltage in a circuit?

  It decreases
• If a circuit has a voltage of 12V, a current of 3A, and time of 5s, what is the energy transferred?

  180 J
• The conservation of electric energy ensures that energy is not lost or gained, but only transformed from one form to another.

  True
• Match the form of energy with its source:

  Potential Energy ↔️ Position in an electric field

  Kinetic Energy ↔️ Movement of charge carriers

  Thermal Energy ↔️ Heat generated in a circuit

  Light Energy ↔️ Emitted from charged particles
• As potential energy decreases, kinetic energy increases in an electric field due to the conservation of energy.


  True
• What is the unit of energy in electric circuits?

  Joule (J)
• In a flashlight, chemical potential energy is converted into electrical energy and then into light energy