Warm – Up: True or FalseIf false: Correct the statement

1. The law of electric charges claims that like charges attract one another

2. In the electrostatic series, materials are arranged in order of their electrical conductivity

3. An insulator is a material that prevents the flow of electrical current

Warm – Up: True or FalseIf false: Correct the statement

1. The law of electric charges claims that like charges attract one another FALSE

2. In the electrostatic series, materials are arranged in order of their electrical conductivity FALSE

3. An insulator is a material that prevents the flow of electrical current TRUE

Warm – Up:

4. Why do you think clothes cling to each other after tumbling around in a clothes dryer?

Warm – Up:

4. Why do you think clothes cling to each other after tumbling around in a clothes dryer?

Charging by friction – clothes have rubbed against each other and the dryer wall and have either gained or lost electrons.

BONUS: How could you tell whether a piece of clothing was positively or negatively charged?

Methods of Generating Electricity

• Learning Goals for Today: – To understand the advantages and disadvantages

of using various sources of energy– To distinguish between renewable and non-

renewable sources of energy

Generator

• A machine that turns movement into electrical Energy– Turns magnets past a set of wire coils– The faster the magnets pass over the coils, the

more electricity is produced

• Turbines spin generators to produce electricity

Energy Sources in Ontario

Renewable Resources

• Naturally occuring materials or energy that can replace themselves through natural cycles and management practices (e.g. sun, wind, falling water, trees)

Nuclear• How it works:– Energy released by splitting

atoms– Steam turns generator

• Advantages:– High energy output– No air emissions

• Disadvantages:– Safety: radioactive waste– Expensive– Mining disturbs ecosystems

• Not Renewable

Coal, Natural Gas & Oil

• How it works:– Fuel burned, heat boils water,

steam spins turbines• Advantages:– Cheap

• Disadvantages:– Pollution: smog, acid rain,

releases CO2

– Mining disturbs ecosystems• Not Renewable

Hydro Electric

• How it works:– Rushing water spins turbines

• Advantages:– Cheap– Non-polluting

• Disadvantages:– Needs moving water– Damming disturbs

ecosystems• Renewable

Wind• How it works:– Wind spins turbines

• Advantages:– No pollution

• Disadvantages:– Need wind– Small amount of energy– Local residents: sound, sight– Effect on wildlife?

• Renewable

Biomass• How it works:– Biomass burned, releases heat, spins turbine

• Advantages:– Simple– Readily available

• Disadvantages:– Pollution

• Renewable

Geothermal• How it works:– Heat stored in Earth spins turbine

• Advantages:– No fuel needed– Sustainable

• Disadvantages:– Expensive to start

• Renewable

Solar Energy• How it works:– Photons from sun knock electrons off atoms,

electrons flow through to battery• Advantages:– No pollution

• Disadvantages:– Need lots of light– Small amount of energy

• Renewable

Electricity Generation Methods

http://www.youtube.com/watch?v=20Vb6hlLQSg