528746
Description
Mind Map by Oliver Wood, updated more than 1 year ago
|
Created by Oliver Wood
about 10 years ago
|
|
Living for the Future
- Solar Energy
- Photocells
- Robust, little maintainance
- Solar fuel, no long cables
- No pollituon
- P-N silicon junction
- P-type has absence of free electrons
- N-type has excess free electrons
- Photons excite electrons
- Electric current produced
- Electric current produced
- P-type has absence of free electrons
- (-) No energy when dark/cloudy
- Output:
- Light intensity
- Surface area
- Distance from light source
- Light intensity
- DRAW OUT
- Robust, little maintainance
- Passive heating
- Glass lets in shorter IR radiation
- IR absorbed by walls and floor, heat up
- IR re-emitted at longer wavelength
- Glass reflects longer wavelength IR inside
- Glass reflects longer wavelength IR inside
- IR re-emitted at longer wavelength
- IR absorbed by walls and floor, heat up
- Glass lets in shorter IR radiation
- Wind energy
- Windspeed dependent
- Will not work in too little/too much wind
- Will not work in too little/too much wind
- No CO2
- Noisy. take space, "NIMBY"
- Windspeed dependent
- Photocells
- Generating Electricity
- The Dynamo effect
- Wire coil in a magnetic field = Current
- Induced current
- Induced current
- Increasing the effect:
- Faster moving magnet
- More wire coils
- Stronger magnet
- Faster moving magnet
- To reverse current:
- Rotate magnet in opp. direction
- Reverse magnet polarity
- Rotate magnet in opp. direction
- Either the coil OR the magnets can move
- Always AC
- DRAW OUT
- Wire coil in a magnetic field = Current
- Power Stations
- Water boils to steam
- High-pressure steam drives turbine
- Turbine drives Generator
- Turbine drives Generator
- High-pressure steam drives turbine
- Water boils to steam
- Energy Efficiency
- Energy lost at each stage
- Efficiency = Useful output / Total input
- Energy lost at each stage
- The Dynamo effect
- Global Warming
- Most electromagnetic waves pass through atmosphere
- IR absorbed at short wavelengths by Earth
- Re-emitted at long wavelengths
- Long wavelengths trapped
- CO2
- Volcanic eruptions
- Forest fires
- Organic decay
- Oceans emit it
- Respiration
- Volcanic eruptions
- CO2
- Long wavelengths trapped
- Re-emitted at long wavelengths
- IR absorbed at short wavelengths by Earth
- Greenhouse Gases
- Methane
- Decay lacking oxygen
- Wetlands, oceans
- Decay lacking oxygen
- CO2
- Water vapour = Most potent
- Occurs naturally
- Occurs naturally
- Methane
- Dust : Two effects
- Factory smoke traps IR
- Temp. Increases
- Temp. Increases
- Volcanic ash reflects IR
- Temp. falls
- Temp. falls
- Factory smoke traps IR
- Most electromagnetic waves pass through atmosphere
- Fuels for Power
- Measuring power
- Appliances use a certain
amount of power per second
- Power = Voltage x Current
- Watts
- Watts
- Energy supplied = Power x Time
- Kilowatt Hours (kWh)
- Kilowatt Hours (kWh)
- Appliances use a certain
amount of power per second
- Cost of Energy
- Cost = Energy used x Cost per kWh
- Often lower rates at night (off-peak)
- Cost = Energy used x Cost per kWh
- Choices of Sources
- Availability
- Ease of extraction
- Environmental effect
- Risks associated
- Availability
- The National Grid
- Transformers step up VOLTAGE to 400,000v
- Transport electricity in powerlines
- Transformers step down energy for consumer
- Transformers step down energy for consumer
- Transport electricity in powerlines
- High current heats up wires
- Heat = Energy loss
- Transformers allow higher [Voltage] and lower [Ampage]
- Lowers energy lost
- Keeps cost down
- "When a transformer increases voltage, the
ampage is reduced - Wires don't heat up, and
therefore less energy is lost to the environment
(sink)."
- Lowers energy lost
- Transformers allow higher [Voltage] and lower [Ampage]
- Heat = Energy loss
- Transformers step up VOLTAGE to 400,000v
- PRACTICE EQUATIONS
- Measuring power
Media attachments
Want to create your own Mind Maps for free with GoConqr? Learn more.