Is an electric charge neutral, negative, or either positive or negative?
either positive or negative.
100
Does an electric circuit works when it is a closed path or an open path?
it is a closed path.
100
Which allows electric charges to move through them, conductors or insulators?
Conductors
100
What is an object that attracts most metals?
magnet
100
Which device converts electric energy into useful thermal energy, a light bulb or a toaster?
toaster
200
When an object has no overall electric charge, it is
A. neutral.
B. positive
C. negative
neutral
200
Which device contains an electric motor?
B. a flashlight
C. a cow
D. an electric fan
an electric fan
200
Name two materials that are conductors.
copper, tap water, steel, ...
200
Where are the poles on a magnet?
On the ends.
200
A magnet is attracted to the refrigerator’s door. Is the door made of steel or aluminum?
steel
300
When a balloon is rubbed with a wool, do negative charges move from the wool cloth to the balloon or from the balloon to the wool cloth?
negative charges move from the wool cloth to the balloon.
300
Why might an electric current be dangerous?
Could electrocute you.
300
Name two materials that are insulators?
wood, rubber, plastic, ...
300
What is a magnetic field?
An object that attracts metals OR the area around a magnet where the magnet’s attraction can be observed.
the area around a magnet where the magnet’s attraction can be observed.
300
Do similar poles of a magnet attract or repel each other?
repel
400
What must you do to remove static electricity built up on something?
A. keep it far from another object with a different charge.
B. touch it with another thing with a different charge.
C. touch it with an orange peel.
touch it with another thing with a different charge.
400
Write one way to avoid the dangers of electric currents?
Do not touch exposed wires./ Do not stick your fingers into an electric outlet./ Stay away from places with electrical hazard warning sign.
400
If two balloons both have negative charges, how do they interact?
They repel.
400
13. We can see the pattern formed by the magnetic field a magnet by
A. pouring water over the magnet.
B. sprinkling small bits of iron around the magnet.
C. sprinkling small bits of wood around the magnet.
sprinkling small bits of iron around the magnet.
400
Do opposite poles of a magnet attract or repel each other?
attract
500
What uses motion to make electrical energy? A. Generator B. battery C. your cat
Generator
500
What kind of circuit is it if there is a string of light bulbs along a wire? A. Series circuit B. Parallel circuit C. Circuit city.
Series circuit
500
If two magnets have the South end facing each other, what happens?
They repel.
500
What is a magnet made up of a wire wrapped around an iron rod? A. lightbulb B. electromagnet C. don't walk
electromagnet
500
Magnets do not attract A. steel B. other magnets C. aluminum