the total energy remains constant—it is said to be conserved over time. Energy can neither be created nor destroyed; it transforms from one form to another.
2 of 11
Explain what ‘wasted’ energy is and why it is wasted
Energy that is 'wasted', like the heat energy from an electric lamp, does not disappear. Instead, it is transferred into the surroundings and spreads out so much that it becomes very difficult to do anything useful with it.
Thermal conduction is the transfer of heat (internal energy) by microscopic collisions of particles and movement of electrons within a body
5 of 11
How does conductivity affect the rate of energy transfer
the higher the thermal conductivity of a material the higher the rate of energy transfer by conduction across the material.
6 of 11
Explain what the term ‘efficiency’ means
ability to produce a desired effect, with a minimum of effort or waste
7 of 11
How do you calculate efficiency?
efficiency= energy output, divided by the energy input
8 of 11
Describe ways to increase the efficiency of an intended energy transfer
Go solar, Buying energy efficient products, Turn down thermostat & reduce heat transfer & Reduce standby use in electrical appliences
9 of 11
what are the main energy resources available for use on Earth
fossil fuels (coal, oil and gas), nuclear fuel, bio-fuel, wind, hydroelectricity, geothermal, the tides, the Sun and water waves.
10 of 11
What are the reasons that science does not always have the power to deal with environmental issues
political, social, ethical or economic considerations
11 of 11
Other cards in this set
Card 2
Front
the total energy remains constant—it is said to be conserved over time. Energy can neither be created nor destroyed; it transforms from one form to another.
Back
what does conservation of energy mean
Card 3
Front
Energy that is 'wasted', like the heat energy from an electric lamp, does not disappear. Instead, it is transferred into the surroundings and spreads out so much that it becomes very difficult to do anything useful with it.
Comments
No comments have yet been made