Energy
- Created by: Clare
- Created on: 19-11-12 16:21
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- Energy
- Light
- Solar Energy- Photovoltaic cells
- Converts sunlight directly to electricity
- Sunlight is absorbed by solar panel and gives electrons energy. The current (flow of electrons) can be converted into electrical energy
- Visible light is found in the EM Spec
- Travels faster than sound
- Solar Energy- Photovoltaic cells
- Elastic Potential
- Stored potential energy for a spring
- Hookes Law
- Apply more force= more stretch until the elastic limit
- Directly proportional
- F=Kx
- Force= constant x stretch
- Spring constant (K) stretch of the spring
- Stretch (x) change in elasticity
- Force= constant x stretch
- Apply more force= more stretch until the elastic limit
- Gravitational Potential
- Potential energy for lift
- Energy stored in raised objects
- Electrical
- Energy in electrical charges (static or moving)
- Heat
- Heat Tranfers
- Thermal energy
- Measured in Joules
- Always goes form hot to cold
- Sound
- Humans hear up to 20,000Hz- above this is ultrasound
- Changing pitch= frequency
- Change loudness= amplictude
- Echoes are reflected sound
- We can find out how far away an object is, how fast it is travelling and it's shape
- We know how long it takes for sound waves to be sent and received so we can tell if something gets in the way
- Ultrasound
- Uses: clean delicate objects, medically to break up kidney stones and check baby's development
- Mechanical waves so can NOT travel in a vacuum
- Sound is vibrations
- Diffraction allows sound to bend around corners and obstacles
- Chemical
- Energy between bonds in atoms
- Energy stored in food fuel and batteries
- Nuclear
- Stored in the nuclei of atoms
- Kinetic
- Movement
- As you heat particles they gain kinetic energy
- This means they transfer energy due to increased collisions
- Light
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