Presentation Transcript
Electricity :Electricity
Parts on an atom :Parts on an atom Protons, have a positive (+) charge, found in nucleus
Neutrons, have no charge, found in nucleus
Electrons, have a negative (-) charge. found orbiting nucleus, electrons are electricity
Slide 3:Electricity is the flow of electrons through matter
Static electricity is a build up of electrons
Electric current has a steady flow of electrons
Slide 4:Electrons flow easily through some things, like metals,(conductors) and do not move easily through others(insulators)
AC/DC :AC/DC Direct current in electricity that has the electrons traveling from negative and positive. Electrons go in one direction only. Batteries are direct current
Slide 6:Alternating current has electrons that switch directions.
Household current is alternating current. It is much easier to change voltage of AC, so it can travel more efficiently.
Measuring Electricity :Measuring Electricity The number of electrons flowing past is the current, which we measure in Amps
Voltage difference (volts) is how hard each electron is pressing, pressure, like water from a hose
Slide 8:How hard the material is to travel through is the resistance, measured in Ohms
Think of electricity as traffic, the current is how many cars, the voltage is how fast they are moving and the resistance is how good the road is.
Slide 9:Ohms Law
V=I x R
Where V=Voltage
I=Current
R=Resistance
Generating Electricity :Generating Electricity Electrons move through wire when near a magnetic field.
A generator spins copper wire around a magnet or a magnet around copper wire
Slide 13:To generate electricity something must turn the turbine.
Clean sources
Water from a river or dam can be used
Wind
Geothermal
Slide 14:Burning sources
Steam used to turn turbines
from coal, gas, oil, biomass or nuclear
Solar :Solar Solar panels convert sunlight into electricity directly
Once built, zero emission
Cost/Benefit :Cost/Benefit Cost Benefit
Slide 19:Bibliography
Solar panel image http://eagle.csd49.org/middle/jss/Course_SolarPanel.htm
Turbine http://www.search.com/reference/Water_turbine
Hydroelectric http://www.daviddarling.info/encyclopedia/H/AE_hydroelectric_power.html
Generator http://www.britannica.com/eb/art-66057
Slide 20:Generator http://www.britannica.com/eb/art-66057