Forms of Energy - AQA GCSE Physics Core

Revision notes on types of energy, examples of Sankey diagrams and efficiency.

HideShow resource information
  • Created by: Sophie
  • Created on: 03-01-12 17:01
Preview of Forms of Energy - AQA GCSE Physics Core

First 246 words of the document:

Forms of Energy:
Chemical potential ­ energy stored in a fuel and released when chemical reactions take place
Kinetic ­ energy of a moving object
Gravitational Potential ­ energy of a object due to its position
Elastic (Strain) energy stored in a springy object when it is stretched or squashed
Electrical ­ energy transferred by an electrical current
Thermal ­ energy due to an object temperature
Light ­ also called radiant energy
Sound ­ energy released by vibrating objects
Nuclear ­ energy stored in the nuclei of an atom
Energy is transformed form one form to another:
Eg: A computer: Electrical Energy Light + Sound + Heat
Conservation of Energy:
Energy cannot be created or destroyed
Energy supplied = useful energy + wasted energy
Energy is measured in Joules (J) or Kilojoules (1000J or KJ)
Useful and Wasted Energy:
Useful energy ­ energy transferred to where it is wanted in the form that it is wanted.
Wasted energy energy that is not usefully transformed or transferred.
Wasted energy spread outs into the surrounding.
Useful energy eventually transfers into it surroundings
Energy becomes less useful the more it spreads out because it becomes harder to use it for further
transformations.
Sankey diagrams show this:
Efficiency:
Efficiency = Useful energy transferred by device
(x 100 for a percentage)
Total energy supplied to device
Gravitational potential = weight in Newtons x height increased in metres

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all resources »