Podcast
Questions and Answers
What term describes the different ways energy can be held?
What term describes the different ways energy can be held?
- Energy creation
- Energy stores (correct)
- Energy dissipation
- Energy transfers
What happens when energy is 'transferred'?
What happens when energy is 'transferred'?
- Energy moves from one store to another (correct)
- Energy is created
- Energy changes its form
- Energy is destroyed
Which of these is an example of energy transfer?
Which of these is an example of energy transfer?
- Boiling water in an electric kettle (correct)
- A house standing still
- A book on a table
- A car parked on a hill
Flashcards
Energy
Energy
The capacity for doing work. Energy can be transferred, dissipated or stored in different ways.
System
System
An object or a group of objects.
Energy store
Energy store
The different ways in which energy can be stored, including chemical, kinetic, gravitational potential, elastic potential and thermal stores.
Study Notes
- Energy exists in different 'stores'.
- Energy cannot be created or destroyed.
- Energy can be transferred, dissipated, or stored.
- Energy can remain in the same store for varying lengths of time.
- Energy transfers occur whenever a system changes, altering how energy is stored.
Examples of Energy Transfers
- A boat moves through water as chemical energy converts to kinetic energy.
- An electric kettle heats water by transferring electrical energy to the element, increasing the water's internal (thermal) energy and temperature.
- A swinging pirate ship ride exchanges kinetic and gravitational potential energy.
Types of Energy Transfer
- Heating
- Waves
- Electric current
- A force moving an object
Potential Difference (Voltage)
- It measures the energy given to charge carriers in a circuit, in volts (V).
- Voltage facilitates electric current flow between two points.
- Energy is released by the material, reducing its internal energy.
- Infrared radiation from the Sun is emitted into space.
Work
- 'Work' is the scientific term for energy transfer.
- Examples of doing work include a grazing cow, a firing catapult, and a boiling kettle.
Diagrams
- Diagrams illustrate energy transfers between stores.
- Transfer diagrams use boxes to represent energy stores and arrows to show energy transfers.
- A child at the top of a slide: Gravitational energy converts to kinetic and internal energy due to mechanical work and friction. Energy shifts from gravitational potential energy to kinetic and internal energy.
- Sankey diagrams illustrate how energy is transferred into different stores.
- Useful for showing energy amounts.
- The arrow width represents the amount of energy.
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