Download Electricity and Resources Study Guide Answers

Electricity and Resources Study Guide
1. Name three gases that contribute to the greenhouse effect. & list 3 natural resources that are
responsible for putting these gasses in the atmosphere.
carbon dioxide, methane, water vapor - petroleum, coal, & natural gas
2. Why is the ozone layer important to life on Earth, & what is the main cause of its depletion?
It protects from harmful UV radiation. CFCs (chlorofluorocarbons) are chemicals that deplete
the ozone layer.
3. What is the primary cause of global warming?
burning fossil fuels releases carbon dioxide into the atmosphere
4. Name five renewable energy sources.
hydroelectric, solar, wind, geothermal, biomass
5. How does a generator create electricity?
by spinning a coil of wire inside a magnet
6. What is the most common fuel for electric power plants?
burning fossil fuels (mainly coal)
7. How does the thickness of a wire affect its resistance?
The thicker the wire the less resistance so the more current can flow
8. What does a transformer do?
A transformer decreases the amount of voltage before electricity enters a home or building.
9. List five ways to conserve energy & reduce the effects of human impact on global warming. (see
web quest & bell work for more ideas)
Use energy efficient fluorescent bulbs and appliances, car pool, turn off light when not in a
room, better insulation in your home, change thermostat settings
10. Why must electricity be transmitted at a high voltage through the power grid?
to overcome resistance over long distances. Voltage decreases over long distances so high
voltage must be used.
11. What is the difference between AC and DC current?
AC- alternating current- can change voltage and direction of flow
DC- direct current- flows in one direction- found in batteries
12. Why is AC current used instead of DC in the power grid?
AC can be transformed to higher or lower voltages.
13. Which type of power plant uses heat from Earth’s crust to produce steam?
Geothermal
14. Describe the path of electricity from the power plant to a home or business.
power plant, substation, transformer, junction box, outlet
15. Why is important that your house is well insulated?
to prevent heat loss and save energy
16. Name four energy-efficient devices.
fluorescent bulbs, hybrid cars, Energy-star appliances, solar phone chargers, anything solar
powered, electric cars
17. What is the primary causes of CO2 levels increasing in the last 50 years?
Deforestation & increase in burning of fossil fuels for cars & electricity
18. What 2 major activities of humans contribute to the possible depletion of non-renewable
resources.
Electricity & vehicles