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An overview of the key points for GCSE Energy and Electricity units.

Chris Thornton

on 30 January 2013

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Transcript of Energy/Electricity

By Mr Thornton Electricity Energy Types Active Potential Thermal Nuclear Chemical Elastic Gravitational Electrical Kinetic Light Sound WASTE Anything we burn
Anything we eat
Batteries View this presentation online at: http://prezi.com/edtswywnfv_s/ Transfers Simple Diagrams Electrical Light
bulb Thermal Light WASTE Chemical Thermal Kinetic Sound Car Efficiency Will ALWAYS be between:
zero and one
0% and 100% Sankey Diagrams Sources Keeping
Warm Non-Renewable Renewable Fossil Fuels Nuclear Fuels Coal
Gas Uranium
Plutonium Energy/Electricity Distribution Meeting
Demand Paying
The Bill Solar Convection Conduction Radiation Any hot fluid (liquid or gas) Faster particles in hotter parts of the fluid
Makes the hot parts less dense
Less dense fluid rises
Colder, denser fluid pushed down Solids All particles are vibrating
Hotter particles vibrate more
Vibrations passed to any surrounding particles
Fastest in metals; slowest in glass/plastic/wood etc. Infrared rays Similar to light:
Can travel through vacuum
Absorbed/emitted best by dark/matt surfaces Hydroelectric
Power (H.E.P.) Wave Tidal Geothermal Wind Generation Fuel burnt or breaks down radioactively
Water heated to steam
Steam turns turbine

Turbine turns generator
Generator generates electricity { { { { Fossil + nuclear fuels Fossil fuels Nuclear fuels All energy resources except photovoltaic cells (solar electricity) National Grid Image via National Grid Image via National Grid Image via National Grid Image via First Hydro Image via First Hydro Image via First Hydro Huge circuit covering the whole country, carrying electricity from power stations to wherever it's needed Image via Geograph Image via Geograph Image via Geograph Image via Geograph Image via eHow Power station Step-up
transformer Pylons, etc.
National Grid Step-down
transformers Homes and
workplaces 25,000 V 400,000 V 230 V N.B. UK mains voltage may be between 220V and 240V, and it's 50Hz A.C. UK Electricity Use Over A Typical Day UK Electricity Use Over A Typical Week Useful energy (or power) OUT

Total energy (or power) IN ÷ Against For Concentrated sources
Don't depend on weather Will run out
Pollution (fossil fuels) or radioactive waste (nuclear fuels) Carbon dioxide (ALL) - Climate change
Sulphur dioxide (COAL) - Acid rain For Against Won't run out
No pollution/waste Heat from the Earth's core, due to nuclear reactions taking place there "Dilute" sources of energy
Some depend on unpredictable weather
Some damage habitats
Some may be considered eyesores Image via arizona.edu Image via arizona.edu Image via The Chinese University of Hong Kong Image via
directindustry.com Image via NOAA Image via thephysicstutor.com Units of electricity are kilowatt-hours (kWh) To find out how many units have been used, either:
Subtract the smaller meter reading from the larger one,
Multiply the power of the device in kW (1000's of W) by how many hours it's switched on. You may also need to multiply the number of units by the cost (in pence) per unit.
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