P3 - Physics OCR
OCR 21st Century revision guide for P3
- Created by: !eva!
- Created on: 03-11-14 21:56
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- P3
- Sustainable Energy
- Sources:
- Secondary - don't come straight from nature e.g. electrical energy
- Primary - come straight from nature e.g. solar energy
- Fossil fuels are not sustainable because they damage the environment and are not replenished fast
- Sources:
- Power
- Power = Current x Potential Difference
- Units:
- Watt/Kilowatt
- Voltage
- Current
- Ampere
- Rate
- To flow, energy needs a potential difference and a closed circuit
- Buying Electricity
- Cost = No. of Units x Cost per Unit
- Energy Prices are rising because supply is dwindling while demand is growing
- Kilowatt hours (kWh) are kliowatts x hours
- Energy Diagrams and Efficiency
- Chemical Energy + Electrical Energy --> Kinetic Energy + Light Energy + Thermal Energy
- Energy cannot be destroyed or created, just changed in form
- Sankey Diagrams
- Wasted energy is not used up, just transformed into an unusable form
- Generators
- Power Station
- Adv. and Disadv. of Nuclear and Sustainable Sources
- Sustainable Energy
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