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Unit 1 Physics AQA - Pre Exam brief

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by

Richard Oren

on 12 June 2014

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Transcript of Unit 1 Physics AQA - Pre Exam brief

Energy
Unit 1 Physics
"Energy cannot be created or destroyed, it is only transformed from one type to another"
Types of energy:
light
sound
thermal
kinetic
electrical
nuclear
chemical
sprung
gravitational potential
Types of Stored Energy
Sankey Diagrams
- show Energy Transformations
Wasted Energy goes into environment
Useful Energy (eventually spreads out into environment)
Efficiency
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:
Conduction
Convection
Radiation
needs particles
a 'wave' (Infra Red)
Silver - GOOD REFLECTOR
Black - POOR REFLECTOR
Silver - POOR Absorber/Emitter
Black - GOOD Absorber/Emitter
STOP HEAT MOVING!
Trap AIR!
Insulation
LOFT insulation
Cavity Wall insulation
Double Glazing
PAYBACK Time
How long would it take to pay for itself - before you start to SAVE money?
Is it a good deal?
Electrical Energy
Electrical devices
Buying the electricity
Generating the Electricity
Getting the electricity to houses
kW
Energy = Power X Time
h
kWh
J
W
s
Cost = kWh X cost per kWh
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
Start-up time
Decommissioning (shut down)
CO2:
Greenhouse gas
Global Warming!
Reliability
Visual pollution
Impact on evironment
Less heat lost
More efficient!
'U' Values (Insulation)
1 - good insulator
1000 - poor insulator
USE equation sheet!
Transverse
Longitudinal
WAVES
ENERGY
particles
particles
ElectroMagnetic Waves (transverse - no particles)

Communication (any dangers?)
Light - VERY small wavelength
ALL same speed (speed of light)
Light:
Reflection
Refraction
Diffraction
FREQUENCY
WAVELENGTH
AMPLITUDE
Speed=wavelength X Amplitude
Sound:
Longitudinal
Frequency - Pitch
Amplitude - Volume
The Universe
Big Bang
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
Answer EVERYTHING
MARKS GAIN PRIZES - GRADES!
Full transcript