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Definition
| When a fluid is heated it becomes less dense and displaces the denser particles and rises. As the less dense particles rise they cool becoming denser and then they fall this creates a convection current.Covection is always to do with heat transfer through fluids(liquids or gases). |
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Definition
| Heat transfer through metals and liquids.Heat is transfered through metal when the metal ions release electrons that collide with each other freeing more electrons through the metal. |
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Term
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Definition
| Radiation is when thermal energy is transfered through anything by infra radiation. shiny surfaces reflect this radiation .Dark matt surfaces absorb heat and are good emittors. |
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Definition
| Heat always transfers from hot to cold.Convection and conduction can be reduced by trapping air or creating vaccums. Common forms of insulation are;Double glazing,wall insulation, loft insulation. |
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Term
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Definition
Thermal, Electrical,Kinetic
Potential Energy sources can be stored
Chemical,Gravitational,Elastic-Potential |
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Term
| How nucleur power is derived |
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Definition
| Nuclear fission,When a single neutron is fired at an unstable uranium atom it splits releasing thermal energy as well as firing out other electrons.This creates a chain reaction creating thermal energy.Rods are raised or lowered in the reactor to soak up neutrons to increase or decrease te amount of atoms splitting, effectievley regulating thermal output. |
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Term
| How nuclear power creates electricity |
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Definition
| The reactor produces thermal energy which is transfered through a coolant to a boiler which heats up water at pressure to create steam to power a turbine that in turn powers a generator. |
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Term
| Nuclear power energy transform diagram |
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Definition
| Atomic potential-Thermal-Kinetic-Electrical |
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Term
| Disadvantages of a nuclear powerstation |
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Definition
-Takes time for the reavtor to reach critical mass
-Produces radiactive toxic waste that has a half live of hundreds of years.
-Can cause devastating damage if it malfunctions and explodes
-Exspensieve and has to be specialy decommishioned.
-Uranium is non-renewable nd rare and exspensieve. |
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Term
| Advantages of Nuclear power |
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Definition
-1000X the energy from 1kg uranium than 1kg coal.
-Doesnt need much matainence or control once active.
-Doesnt produce greenhouse gases or carbon emmisions. |
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