PHYSICS MAP 1A

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  • Created by: Shine.7
  • Created on: 12-04-14 14:23
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  • Physics 1A
    • states of matter and particles
      • C/ C/ R
        • Surface colour+ Texture
        • Metals- Conductors-Free electrons
          • Vibrating-kinetic e- neighboring particles.
        • Convection Currents= Change in Density
    • Rate of Transfer
      • FACTORS: Surface area(larger-quick transfer)   FINS(increase surface-emit heats quick)
      • TYPE OF MATERIAL: good conductors-quick transfer than Insulating material
      • DIFF VOLUME: small vol= cools quickly
    • Condensation. Gas- lose Kinetic-closer together-temp cold enough-Liquid
      • Evaporation. Liquid-Fast particles/More Kinetic-leave. -Average speed decreases-temp of liquid falls-COOLING EFFECT(i.e sweat-evaporates-cool)
        • Rates will be faster due to: TEMP/ DENSITY AIRFLOW
          • ie. EVAPORATION: high temp/ low density/large S.A and airflow=greater ( CONDENSATION is opposite)
    • VACUUM FLASK
      • Glass bottle(double walled w/ vacuum) STOPS conduction/convection.
        • PLASTIC stopper(w/foam) reduce heat conduction.
      • Walls- SILVER- reduces heat loss-RADIATION.
        • INSULATING FOAM: reduces heat conduction TO/FRom outer glass
    • PAYBACK TIME(YRS)= initial cost/annual savings (£)
      • MOST EFFECTIVE(insulation-reduce energy transfer)= BIGGEST AN. SAVINGS(saves most)
      • MOST COST-E= SHORTEST PAY-B Time
      • U-VALUE= lower-better insulator.
        • High U-Val.=FASTER heat transfer
    • ENERGY TRANSFER- 1 FORM TO ANOTHER.
      • NEVER CREATED OR DESTROYED
        • EITHER STORED/ DISIPPATED (spread out to surrounding)
      • USEFUL  WHEN IT'S CONVERTED
    • COST OF ELECTRICITY:                       UNITS= kWx hours
      • COST= units x Price
      • 1KW= 1000 W
        • KWh-  1KW left for an hour = 1000x 60mins
    • SANKEY: efficiency and wasted energy.
      • Less energy wasted=efficient
      • Efficiency= useful energy out/total energy  (X100 to get %)
      • No device is 100% efficient + wasted energy= SPREAD OUT as heat.
        • Electric heaters- exception-very useful

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