1.1.2 Understanding Energy Transfers

• What is energy transfer defined as?

  Movement of energy within a system
• Energy transfer involves the movement of energy from one store to another within a system.
• When a ball rolls down a hill, its gravitational potential energy is transferred into kinetic energy.
• What happens to energy stores during energy transfer?

  One increases, one decreases
• In a mechanical energy transfer, energy moves via physical motion or work.
• Electrical energy transfer occurs through electrical circuits.
• What is the primary cause of thermal energy transfer?

  Temperature differences
• Thermal energy transfer can occur through conduction, convection, or radiation.
• Energy transfer within a system always results in the creation of new energy.

  False
• During energy transfer, energy moves from one energy store to another within a system.
• Order the types of energy transfers based on their primary cause:

  1️⃣ Physical motion or work (Mechanical)

  2️⃣ Electrical circuits (Electrical)

  3️⃣ Temperature differences (Thermal)
• What type of energy transfer occurs when boiling water on a stove?

  Thermal
• What is energy transfer within a system?

  Movement from store to store
• Energy transfer occurs when energy moves from one energy store to another within a system.system
• Energy transfer involves changing energy from one form to another within a system.
• What is an example of mechanical energy transfer?

  Lifting a box
• Electrical energy transfer occurs through electrical circuits
• Thermal energy transfer involves heat moving due to temperature differences.
• Match the heating method with its description:

  Conduction ↔️ Heat transfer through direct contact

  Convection ↔️ Heat transfer through fluid movement

  Radiation ↔️ Heat transfer through electromagnetic waves
• Order the main methods of heating based on their primary medium of transfer.

  1️⃣ Conduction (direct contact)

  2️⃣ Convection (fluid movement)

  3️⃣ Radiation (electromagnetic waves)
• What is the formula for calculating work done?

  $W =$$Fd$
• In the formula for work done, $W$ represents the work done in joules
• Energy transfer through heating always requires a temperature difference.
• What type of heating occurs when you hold a hot cup of coffee and feel the heat?

  Conduction
• Conduction is the transfer of heat through direct contact
• Order the energy forms in the example of a ball rolling down a hill.

  1️⃣ Gravitational potential energy

  2️⃣ Kinetic energy
• Heat convection involves the movement of liquids or gases.
• What is an example of heat transfer through radiation?

  Feeling warmth from the sun
• When a ball rolls down a hill, its gravitational potential energy is converted into kinetic energy.
• There are several ways energy can be transferred, including mechanical, electrical, and thermal
• Mechanical energy transfer involves physical motion or work.
• What is an example of electrical energy transfer?

  Powering a light bulb
• Thermal energy transfer occurs due to temperature differences
• When a ball rolls down a hill, its gravitational potential energy is converted into kinetic energy.
• Steps in energy transfer within a system

  1️⃣ Energy moves from one store to another

  2️⃣ Energy changes from one form to another

  3️⃣ Energy increases in one store

  4️⃣ Energy decreases in another store
• Work done is the energy transferred when a force moves an object over a distance
• What is the formula for calculating work done?

  $W =$$Fd$
• Lifting a box is an example of mechanical energy transfer through work done.
• What are the three main methods of energy transfer through heating?

  Conduction, convection, radiation
• Match the heating method with its description:

  Conduction ↔️ Heat transfer through direct contact

  Convection ↔️ Heat transfer through fluid movement

  Radiation ↔️ Heat transfer through electromagnetic waves