P2 - Sustainable energy Flashcards
What are the 8 energy stores
Thermal energy
KE
GPE
Chemical energy
Nuclear energy
Electromagnetic energy
Electrostatic energy
What does a system mean (energy)
A single or group of objects, which you are looking at the energy stores in them
How can energy be transferred
Mechanical work
Electrical work
Heating
What happens in energy transfer by heating
Energy is transferred from a hotter region to a colder region
What is conduction
The vibrating particles transfer energy to their surrounding particlesW
What is convection
Where the energetic, hot particles, move away from hotter to colder reigons
What is radiation
When energy is transferred by waves, e.g EM waves or sound waves
What is the same thing as work done
Energy transferred
What are the 2 types of work
Mechanical work or electrical work
What is the conservation of energy principle
Energy cannot be created or destroyed, only transferred
What does it mean if the energy is dissapated
Not transferred to the store you want - usually to the thermal energy store of the surroundings
What is dissipated energy called
Wasted energy
What is a closed system
A system where matter or energy cannot enter or leave
What is the net energy change in a closed system
Always zero
What is power in simple terms
The rate of energy transfer
How do you work out the total energy transferred based on the power of the appliance, and the time it was on for
Energy transferred = Power x Time
What is one kWh
The amount of energy a device with 1kW of power transferred is one hour
What are kWh and J both measures of
Energy (transferred)
What is 1 kWh in J
3 600 000
What is the formula for efficiency
Efficiency = Useful energy transferred/total energy transferred
How can you reduce energy losses in buildings
Thermal insultion
What are the main non-renewable sources of energy
Coal, Oil, and Gas
What is a renewable energy source
One that will never run out
What are the man renewable energy sources
Biofuels, wind, solar, hydroelectric, tidal
