1. Electric Energy at Home
Chapter 6

2. Loss of Power
What would happen if you had a power outage at your house?
List all of the things that would be affected if you lost electricity to your home
What would happen if you had a power outage in Airdrie?

3. Alberta
Most of our energy comes from burning fossil fuels (coal, natural gas), to get electricity
Potential chemical energy being converted into ________________

4. Michael Faraday investigated magnetic fields
found that if you push a magnet through a coil of wire it creates an electric current
More coils equals a stronger magnetic field
These observations helped him create his first electric generator

5. Generating Electric Energy
Section 6.1

7. generator
made of a magnet and a coil of wire
generators creating electricity to power buildings are huge
kinetic energy  generator  electric energy
input converter output

8. Generating and Distributing Electric Energy
Section 6.2

9. Turbine Generator electricity is made in a generator
which contains one or more turbines
the turbines turn and their kinetic
energy is transformed into
electricity

10. Thermo-electric Power Plant
common in Alberta
coal is broken down into a powder
it is burned, converting water into steam
steam flows through pipes to spin a turbine
turbine turns generator which creates electricity

11. Electricity from Water
produces a lot of Canada’s electricity
uses kinetic energy from falling water
clean and efficient

12. Splitting Atoms for Energy
Uranium atoms are split by nuclear fission
this splitting releases a large amount of energy
this thermal energy makes steam which turns a turbine

13. Distributing Electricity
Downfalls to moving electricity great distances?
can lose a lot of electricity to thermal energy as it is transferred to various areas through electrical lines
Powerlines freeze with moisture, get knocked down and damaged

14. Electric Energy and Power
Section 6.3

15. Energy and Work energy = the ability to do work
Work (Joules) = Force (newtons) x distance (meters) W = Fd
units = Joules (J)

16. Power Power = rate at which energy is transferred
how fast energy is used or produced
measured in Watts (W) 1W = 1J/s
Power = Energy/time P = E/t

17. Example
A generator produces 2 J of electric energy every second. How many watts of power does it produce?

18. Watt-hour (W•h) = measuring consumption of energy
Energy = Power x time
E = Pt
kilowatt-hour (kW•h) = 1000 W•h

19. Examples
How much electric energy does a 100 W light bulb use if it is left on for one hour?
How much electric energy does a 240 W fan use if it is left on for two hours?
A small kettle is rated at 1000 Watts. This means it uses 1000 W for each hour it is used. If it is used for 2 hours how much energy does it use in kilowatt hours?

20. Efficiency and Saving Energy
Section 6.4

21. efficiency – measure of how completely input energy is converted to output energy
how much input becomes output (how good is the machine in creating the proper energy)
written as a percent
%efficiency = (useful energy output/total energy input) x 100%

22. Examples
An incandescent light bulb uses J of electric energy. It emits only 900 J of useful energy. What is the efficiency of the light bulb?