Vocabulary
Circuits
Electric Charges
Atoms
100
What is the term for a buildup of electric charge on something?
Static electricity
100
What type of circuit is complete? a.) closed circuit b.) open circuit
a.) closed circuit
100
What happens if an object with a positive charge comes near another object with a positive charge?
They repel each other
100
What type of charge does a proton have?
Positive
200
What is the result of a wire touching both ends of the battery?
An electric current
200
What type of circuit is incomplete? a.) closed circuit b.) open circuit
b.) open circuit
200
Mr. Cruz rubs a comb with a wool cloth and holds the comb near, but not touching, some bits of paper. Are the bits of paper attracted to or repelled by the comb?
The bits of paper are attracted to the comb (it has a negative charge)
200
What type of charge does a neutron have?
Neutral
300
What machine changes electrical energy into the energy of motion?
An electric generator
300
Page 533 #14
D
300
Mrs. King rubs a balloon on her head to give it a negative charge. What will happen if she holds the balloon near the wall? a.) it will stick to the wall b.) it will not stick to the wall
a.) it will stick to the wall - a negatively charged object is attracted to an uncharged object
300
What type of charge does an electron have?
Negative
400
What converts mechanical energy into electricity?
A generator
400
Draw an example of closed circuit that contains a light bulb, a battery, two wires, and a paper clip. What happens if you switch the paper clip with a popsicle stick?
The circuit will no longer work - the popsicle stick is not a conductor. It is an insulator.
400
Mrs. Stambaugh connects a string to two tennis balls and hangs them so they are close to each other, but not touching. Later, she finds that they have moved closer to each other and are touching. What happened to the charges on the tennis balls?
They have opposite charges and attracted
400
Draw an atom with two protons and two neutrons stuck together, and two electrons floating near the edges. What type of charge does this atom have?
Neutral
500
What is the name for a device in which a current produces magnetism?
An electromagnet
500
Page 534 #21
Circuit A = parallel, Circuit B = series. Parallel circuits are connected in more than one way, so if one part is removed, the light will still work because there is still an electric current. Series circuits are connected in one way, so if one part is removed, it becomes an open circuit and there is no electric current.
500
Glass usually has a positive charge. Your TV screen is made of glass. Why would your TV screen become dusty before other furniture?
The dust might be negatively charged. Negative and positive charges attract, so the TV attracts the dust.
500
Draw a diagram with two protons and two neutrons stuck together in the middle, and two electrons near the edges. If this atom loses an electron, what is the new electric charge?
Positive
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