PHYSICS MAP 1A
- 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
- C/ C/ R
- 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)
- Rates will be faster due to: TEMP/ DENSITY AIRFLOW
- Evaporation. Liquid-Fast particles/More Kinetic-leave. -Average speed decreases-temp of liquid falls-COOLING EFFECT(i.e sweat-evaporates-cool)
- 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
- Glass bottle(double walled w/ vacuum) STOPS conduction/convection.
- 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
- NEVER CREATED OR DESTROYED
- 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
- states of matter and particles
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