Electricity and Resources Study Flashcards
(18 cards)
- 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.
- What is the primary cause of global warming?
burning fossil fuels releases carbon dioxide into the atmosphere
- Name five renewable energy sources.
hydroelectric, solar, wind, geothermal, biomass
- How does a generator create electricity?
by spinning a coil of wire inside a magnet
- What is the most common fuel for electric power plants?
burning fossil fuels (mainly coal)
- How does the thickness of a wire affect its resistance?
The thicker the wire the less resistance so the more current can flow
- What does a transformer do?
A transformer decreases the amount of voltage before electricity enters a home or building.
- 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
- 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.
- 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
- Why is AC current used instead of DC in the power grid?
AC can be transformed to higher or lower voltages.
- Which type of power plant uses heat from Earth’s crust to produce steam?
Geothermal
- Describe the path of electricity from the power plant to a home or business.
power plant, substation, transformer, junction box, outlet
- Why is important that your house is well insulated?
to prevent heat loss and save energy
- Name four energy-efficient devices.
fluorescent bulbs, hybrid cars, Energy-star appliances, solar phone chargers, anything solar powered, electric cars
- What is the primary causes of CO2 levels increasing in the last 50 years?
Deforestation & increase in burning of fossil fuels for cars & electricity
- What 2 major activities of humans contribute to the possible depletion of non-renewable resources.
Electricity & vehicles
- 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
