David is a student who is studying electricity. Which is a safe source of energy to use?
A. an electrical transformer
B. D-cell batteries
C. lightning
D. household electrical outlets
D-cell batteries
100
Which of these is an insulator?
A. metal wire
B. cloth
C. pan for cooking
D. paper clip
B. cloth
100
Look at the drawing. What could be done to make the light bulbs shine brighter?
add another energy source (battery)
200
Where are magnets the strongest?
at the poles
200
Mrs. Teague used an electromagnet to pick up paper clips. The paper clips fell off. Why?
the flow of electricity stopped
200
Which of these is a conductor?
A. metal
B. plastic
C. cloth
D. rubber
A. metal
200
Why is it best to use electrical wires made out of metal?
Metal is a conductor and the electricity moves easily through metal.
200
What is the source of power in Diagram 1?
A. a switch
B. two batteries
C. a bulb
D. a battery
D. a battery
300
Why do ring magnets on a pencil seem to float in the air?
They push apart when like poles are together.
300
Why does a compass work?
Because the Earth is a large magnet.
300
What is the main function of a switch?
A. to make the battery last longer
B. to start and stop the flow of electricity
C. to prevent the wires from getting hot
D. to act as an energy source in a circuit
B. to start and stop the flow of electricity
300
Draw a parallel circuit.
check student drawing
300
Draw a series circuit.
check student drawings
400
What is one way to make an electromagnet stronger?
add more coils or add another energy source (another battery)
400
I put a paper clip in a glass of water. I use a magnet on the outside of the glass. What will happen?
The magnet will attract the paper clip through the glass of water.
400
Look at the following pictures. Which bulbs will light?
A. 1 and 2
B. 1 and 3
C. 2 and 3
D. 3 only
B. 1 and 3
400
Which part of the bulb gives off light?
A. 1
B. 2
C. 3
D. 1 and 3
A. 1
400
Which describes the circuit in Diagram 1?
A. a complete circuit with two bulbs in parallel
B. a complete circuit with two bulbs in a series
C. a complete circuit with two energy sources
D. a complete circuit with one receiver
A. a complete circuit with two bulbs in parallel
500
A paper clip is under a piece of cardboard. I place a magnet on top of the cardboard, and it attracts the paper clip. What is acting as the temporary magnet?
the piece of cardboard
500
Electric generators are used to change mechanical energy into electricity. Which best describes what would be in an electric generator?
A. round magnets
B. spinning magnets
C. ring magnets
D. horseshoe magnets
B. spinning magnets
500
If a wire came loose in a series circuit, would the bulb still light?
No, there is only one pathway for the electricity to flow.
500
Which of the following are electrical receivers?
A. car, paint
B. gasoline, battery
C. tires, seatbelts
D. headlights, radio
D. headlights, radio
500
Name an energy receiver in the classroom.
overhead, pencil sharpener, overhead lights, computer, etc. (anything that uses electricity or a battery to work)