Energy
- Created by: Epic Al
- Created on: 25-06-22 11:39
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- Energy
- Energy resources
- Energy demands
- most energy comes from burning fossil fuels
- nuclear power, biofuels and renewable resources are also used
- Renewable energy
- Wind turbine
- Wave power
- uses the motion of the waves to generate electricity
- Hydroelectric
- water turns turbines in a dam to generate electricity
- Solar
- use the suns energy to heat water directly
- Geothermal
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- Energy demands
- Conservation of energy
- Energy cannot be created or destroyed
- applies to all energy changes
- energy can be transferred between energy stores within a closed system
- Energy dissipation
- Useful energy is energy in the place we want it and the form we need it
- Wasted energy is the energy that is not useful energy
- wasted energy is eventually transferred to the surroundings
- As energy dissipates it becomes less useful
- transfer by heating
- Conduction
- metals are best conductors
- non metal materials are best insulators
- higher thermal conductivity the higher the rate of energy transfer
- a thick layer of insulating material will have a low rate of energy transfer
- Infrared Radiation
- all objects emit and absorb it
- the hotter an object the more infrared it emits in a given time
- black body radiation is a body that absorbs all radiation that hits it
- temperature increases if it absorbs more than it emits
- earths temperature is affected by the level of absorption of radiation from the sun
- Specific Heat Capacity
- Amount of energy needed to increase the temperature of a 1kg substance by 1 degrees C
- energy = mass x specific heat capacity x temperature change
- Conduction
- energy stores
- energy transfers
- Heating
- Waves
- Electric current
- Force by moving the object
- Falling object
- GpE decreases
- Kinetic energy increases
- energy transfers
- Energy resources
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