Show:
Magnets
Electricity & Magnetism
Generators & Motors
Energy & conservation
Grab Bag
100
Where is magnetism the strongest?
The magnetic poles.
100
What is the process of getting electrons to move through a coil of wire by changing the magnetic field called?
Induction
100
What is the reversing switch for a motor called?
A commutator
100
What unit is power measured in and what unit is equal to 1000 watts?
Watt; kilowatt
100
What are the glowing lights seen in the sky near Earth's poles called?
Auroras
200
What are the three materials that stick to magnets?
Iron, nickel, and cobalt.
200
Give two examples of what can make an electromagnet stronger.
Wrapping more coils of wire or moving the electromagnet faster through the coil of wire.
200
What are the four parts of an AC motor?
a. Rotating wire coil (rotor) b. Alternating electric power source c. Transferring brushes d. Permanent magnet(s)
200
What are the five types of energies mentioned in our books?
Hydroelectric energy, wind energy, solar energy, geothermal energy, and tidal energy, (biomass)
200
What happens to an iron or steel object when it is stroked with a magnet or placed in a magnetic field?
It will become a temporary magnet.
300
Describe what happens to magnets in these situations; a. North Pole to North Pole b. South Pole to South Pole c. North Pole to South Pole d. South Pole to North Pole
a. repel b. repel c. attract d. attract
300
What three things does an electromagnet need to work?
A source of electricity, a conductor, and an iron or nickel core.
300
What is the difference between a generator and a motor?
A generator changes mechanical energy into electrical energy, and a motor uses an electromagnet to change electrical energy into mechanical energy.
300
What are the four steps to produce wind energy?
1. Wind turns blades of turbine. 2. Rotor attached to the shaft turns. 3. As shaft turns, it causes gears in gear box to turn. 4. The gears cause generator to turn causing electricity.
300
Give an example of one way to remember what direction magnetic field's flow in.
It will flow in the direction that your right hand will curl in.
400
What are two causes of Earth's magnetic field?
1. It has a nickel and iron core. 2. Earth rotates.
400
Give three examples of what an electromagnet is used for?
Doorbells, blenders, transportation,...
400
Give three examples of things that use electric motors.
Electric motors can be in factories, commuter trains, refrigerators, clocks, blenders,...
400
What are the six steps to make hydroelectricity?
1. Water pushes forward through the dam under great pressure. 2. Water flows through the penstock 3. Turbine spins a shaft from the water pressure. 4. The spinning shaft attaches to the generator which produces electricity. 5. The electricity travels through power lines to a transformer and then to homes and businesses. 6. Water empties into river below the dam.
400
What two things will destroy the magnetic properties of a magnet?
Heating or pounding.
500
What is the difference between a temporary magnet and a permanent magnet?
A permanent magnet keeps it's magnetic properties for a long time. Temporary magnets lose most or all of their magnetic property after they are removed from a magnet.
500
What tool does Michael Faraday use to measure the electric current?
An ammeter.
500
Explain what happens at each of the following places during the system called the electric power grid. a. Power plant b. Generator c. Turbine d. Transformer #1 e. Transmission lines f. Transformer #2 g. Your home
a. Electricity is made at a power plant using coal, natural gas, nuclear energy, solar energy, water power, wind energy, or geothermal energy. b. Inside the generators this energy is converted into another form of energy like mechanical energy or steam. c. This energy turns fan-like blades inside a turbine where after traveling through a shaft, electric current is produced. d. This electric current is sent through transformers that increase the power to push the current longer distances. e. This current is sent over transmission lines that stretch across the country. f. This current travels through transformers again which decrease the voltage so it's safe in your home. g. At your home this current travels through a meter and then through the outlets and switches in your home.
500
Give five examples of ways to conserve energy?
1. Turn off lights when no one is in the room. 2. During the day open blinds or drapes instead of turning on lights. 3. Keep curtains closed on really cold or hot days to keep warm air out or inside. 4. Put signs next to lights that most people forget to turn off. 5. Replace incandescent bulbs with CFL or LED lights. 6. Turn off electrical devices when not in use. 7. Turn down heating thermostat in cold weather and turn up cooling thermostat in warm weather. 8. Close doors and windows when cooling a room. 9. Conserve water
500
How far does Earth's magnetosphere extend into space?
58,000 km (about 36,000 mi)