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Unit 1 Physics AQA - Pre Exam brief
Transcript of Unit 1 Physics AQA - Pre Exam brief
Unit 1 Physics
"Energy cannot be created or destroyed, it is only transformed from one type to another"
Types of energy:
Types of Stored Energy
- show Energy Transformations
Wasted Energy goes into environment
Useful Energy (eventually spreads out into environment)
An efficient device is one that doesn't waste a lot of Energy.
LOOK for the equations in the paper to help you do calculations!
Thermal Energy (Heat)
Difference in temp - movement of thermal energy
Bigger temp difference - faster the movement
Increase surface area (FINS) - faster the movement
Evaporation - takes HEAT with it!
Thermal energy moves by:
a 'wave' (Infra Red)
Silver - GOOD REFLECTOR
Black - POOR REFLECTOR
Silver - POOR Absorber/Emitter
Black - GOOD Absorber/Emitter
STOP HEAT MOVING!
Cavity Wall insulation
How long would it take to pay for itself - before you start to SAVE money?
Is it a good deal?
Buying the electricity
Generating the Electricity
Getting the electricity to houses
Energy = Power X Time
Cost = kWh X cost per kWh
Generating & Moving Electricity
Advantages & Disadvantages
Compare & Contrast
Renewable - can be replaced easily
Non-renewable - cannot be replaced easily
Fuel - CAN BURN (Co2)
NUCLEAR - Fission
Decommissioning (shut down)
Impact on evironment
Less heat lost
'U' Values (Insulation)
1 - good insulator
1000 - poor insulator
USE equation sheet!
ElectroMagnetic Waves (transverse - no particles)
Communication (any dangers?)
Light - VERY small wavelength
ALL same speed (speed of light)
Speed=wavelength X Amplitude
Frequency - Pitch
Amplitude - Volume
Expanding Universe - RED SHIFT
Explosion - CMBR
Cosmic Microwave Background Radiation
The FIZZ on the Radio
Waves are 'stretched' when move away - Doppler Effect
Bigger RED Shift - Faster Moving Away
Read over paper first
You don't need to do it 'in order'
Read Q's carefully & review answers
Use equation sheet
Show ALL working out
Use correct UNITS
Look for 'clues' in the question
MARKS GAIN PRIZES - GRADES!