Podcast
Questions and Answers
Which of the following is an example of an energy store?
Which of the following is an example of an energy store?
- By Waves
- Heating
- Electric Current
- Kinetic (correct)
What is the scientific term for energy being moved from one place to another?
What is the scientific term for energy being moved from one place to another?
- Transferring (correct)
- Storing
- Dissipating
- Creating
In energy transfer diagrams, what do the arrows represent?
In energy transfer diagrams, what do the arrows represent?
- Types of energy
- Energy transfers (correct)
- Amount of energy
- Energy stores
Flashcards
Energy
Energy
The capacity for doing work; it exists in different stores and can be transferred or dissipated but not created or destroyed.
Energy Transfer
Energy Transfer
Moving something from one place to another, such as energy moving from one energy store to another.
Energy Store
Energy Store
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' and can be transferred, dissipated, or stored in various ways.
- Energy cannot be created or destroyed.
- Energy can remain in the same store for varying durations, from fractions of a second to millions of years.
- Energy transfers occur continuously whenever a system changes, altering how energy is stored.
- Examples of energy transfers:
- A boat moving through water converts chemical energy into kinetic energy.
- An electric kettle transfers electrical energy to the heating element, increasing the water's internal (thermal) energy and temperature.
- A swinging pirate ship ride converts kinetic energy into gravitational potential energy.
- Energy can be transferred through:
- Heating
- Waves
- Electric current
- A force moving an object
- Potential difference (voltage) measures the energy given to charge carriers in a circuit and is measured in volts (V).
- Energy is 'given out' by a material, reducing its internal energy.
- Infrared radiation from the Sun is emitted into space.
- "Doing work" signifies energy transfer, as seen in examples like a grazing cow, a firing catapult, and a boiling kettle.
- Transfer diagrams use boxes to represent energy stores and arrows to indicate energy transfers.
- A child at the top of a slide example: Gravitational energy is transferred as mechanical work, increasing kinetic and internal energy.
- Sankey diagrams illustrate how energy in a system is transferred into different stores, using arrow widths proportional to the amount of energy.
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