Human-Harness Electricity
Naturally Occurring Electricity
Electrical Circuits
All Electricity
Conductors and Insulators
100
Humans harness electricity to help power many things we use every day. Which of the following is an example of humans using electricity?
A. A tree growing in the forest
B. A lamp lighting a room
C. A rock sitting on the ground
D. A cloud floating in the sky
B. A lamp lighting a room
100
Which of the following is an example of electricity that occurs naturally in nature?
A. A battery powering a flashlight
B. Lightning during a storm
C. A lamp plugged into a wall outlet
D. A phone charging
B. Lightning during a storm
100
Which two objects are necessary to complete an electric circuit?
A. a light bulb and a switch
B. a power source and a light bulb
C. a path for energy to flow and a switch
D. a power source and a path for energy to flow
D. a power source and a path for energy to flow
100
In a circuit, what is the purpose of the switch?
A. to control the brightness of the light bulb
B. to control the flow of energy through the circuit
C. to prevent energy from going the wrong direction
D. to prevent extra energy from building up in the circuit
B. to control the flow of energy through the circuit
100
The diagrams show the results of an experiment in which electrodes were placed in four different liquids. The electrodes were connected to light bulbs to form circuits.
Which liquids are strong electrical conductors?
A. sugar water and pure water
B. lemon juice and pure water
C. salt water and lemon juice
D. pure water and salt water
C. salt water and lemon juice
200
Which of the following uses electrical energy?
A. burning candle
B. spinning fan
C. guitar being played
D. bicycle being ridden
B. spinning fan
200
What will most likely happen if a comb that has been rubbed with a wool cloth is held near small pieces of paper?
A. The pieces of paper will be attracted to the comb because the papers and the comb will have the same charge.
B. The pieces of paper will be attracted to the comb because the papers and the comb will have the opposite charge.
C. The pieces of paper will repel away from the comb because the papers and the comb will have the same charge.
D. The pieces of paper will repel away from the comb because the papers and the comb will have the opposite charge.
B. The pieces of paper will be attracted to the comb because the papers and the comb will have the opposite charge.
200
A student designs the circuit below.
Which best describes the student's design?
A. The circuit is complete because the wire is connected to both sides of the battery.
B. The circuit is not complete because the wires are not connected to each other.
C. The circuit is complete because it contains a power source, wire, and light bulbs.
D. The circuit is not complete because there should be one battery for each light bulb.
B. The circuit is not complete because the wires are not connected to each other.
200
Which sentence is true about an electrically charged object?
A. It will attract a neutral object.
B. It will repel a neutral object.
C.It cannot attract a positively charged object.
D. It cannot repel a negatively charged object.
A. It will attract a neutral object.
200
What is the best explanation for why wires are often made of copper?
A. Copper is a metal and electricity does not flow easily through it.
B. Copper is a metal and electricity flows easily through it.
C.Copper is not a metal and electricity flows easily through it.
D. Copper is not a metal and electricity does not flow easily through it.
B. Copper is a metal and electricity flows easily through it.
300
Humans harness electricity by using a power source to move electrons through a circuit. Which device is an example of a power source in a simple circuit?
A. Light bulb
B. Battery
C. Switch
D. Wire
B. Battery
300
Which statement BEST explains why lightning is considered a form of electricity?
A. Lightning creates clouds in the sky
B. Lightning is a discharge of electrical energy caused by the movement of electrons
C. Lightning forms when the Sun heats the air
D. Lightning is produced by strong winds during storms
B. Lightning is a discharge of electrical energy caused by the movement of electrons
300
Directions: The diagram shows an electrical circuit into which four different objects were placed in a series with a light bulb and a battery. The table shows the observed results. Use the diagram and table to answer the questions that follow.
Which of the objects are poor electrical conductors?
A. nail and gold nuggetB. piece of foam and nail
C. wooden toothpick and gold nugget
D. wooden toothpick and piece of foam
D. wooden toothpick and piece of foam
300
Electricity is the movement of tiny particles through a conductor. What are these particles called?
A. Atoms
B. Electrons
C. Neutrons
D. Protons
B. Electrons
300
The picture shows a radio with a cord.
Why are the prongs at the end of the cord made from metal?
A. Metal is a good insulator that helps deliver electricity to the radio.
B. Metal is a good conductor that helps deliver electricity to the radio.
C. Metal is a good insulator that helps prevent electricity from leaving the radio.
D.Metal is a good conductor that helps prevent electricity from leaving the radio.
B. Metal is a good conductor that helps deliver electricity to the radio.
400
Humans harness electricity by creating circuits that allow electricity to flow and power devices. What must happen in order for electricity to flow in a circuit and light a bulb?
A. The circuit must be open
B. The circuit must be complete (closed)
C. The wires must be made of wood
D. The battery must be removed
B. The circuit must be complete (closed)
400
The pictures show an experiment in which Arlene rubbed a glass rod with a piece of silk, then placed the rod near her head.
What happens when Arlene places the charged rod near her head?
A. The rod and Arlene's hair have opposite charges, so her hair becomes attracted to the rod.
B. The rod and Arlene's hair have the same charge, so her hair becomes attracted to the rod.
C. The rod transfers charges to Arlene's hair, making them both neutral.
D. The rod takes charges from Arlene's hair, making them both neutral.
A. The rod and Arlene's hair have opposite charges, so her hair becomes attracted to the rod.
400
A student builds a simple circuit with a battery, wires, a switch, and a light bulb. The switch is open and the bulb does not light. Why does the bulb stay off?
A. The battery is too powerful
B. The circuit is not complete, so electricity cannot flow
C. The wires are conducting electricity too quickly
D. The light bulb is producing electricity
B. The circuit is not complete, so electricity cannot flow
400
The table below compares properties of static electricity and current electricity.
A balloon is rubbed with a wool sock. This creates a charge on the balloon, and the balloon sticks to the wall when it is placed next to it. Which of the following correctly explains what type of electricity this is?
A. This is an example of current electricity, because the charge will exist for a long time.
B. This is an example of static electricity, because the charge on the balloon is stationary.
C. This is an example of static electricity, because the charge is controlled by the rubbing.
D. This is an example of current electricity, because the charge was generated by a wool sock.
B. This is an example of static electricity, because the charge on the balloon is stationary.
400
Read the passage about an electrician.
An electrician is someone who installs and fixes electrical wiring and equipment. Tom has worked as an electrician for ten years. His favorite part of the job is installing the wiring in brand new homes. Tom has many tools that he uses to help set up the homes to use electricity.
How would Tom most likely use an insulator?
A. He would use copper wires so that the electricity would easily flow.
B. He would use wires made of plastic so that the electricity would easily flow.
C. He would use plastic-coated wires so that he would not get an electrical shock.
D. He would use copper-covered wires so that he would not get an electrical shock.
C. He would use plastic-coated wires so that he would not get an electrical shock.
500
Humans harness electricity by building power systems that safely carry electrical current through circuits. Which statement BEST explains why electrical wires are made of metal but covered with plastic?
A. Metal wires store electricity while plastic produces electricity
B. Metal wires conduct electricity while plastic insulates and protects people from shocks
C. Plastic helps electricity travel faster through the wire
D. Metal wires stop electricity from flowing through the circuit
B. Metal wires conduct electricity while plastic insulates and protects people from shocks
500
Select three of the following that are examples of naturally occurring electricity.
A. A flashlight uses a battery to light up a dark room.
B. Clothes stick together when they are taken out of a dryer.
C. Water flows over a spinning turbine to power a generator.
D. A bolt of lightning strikes a lightning rod during a thunderstorm.
E. A person's hair stands up after being combed on a dry winter day.
F. A simple circuit lights up a light bulb using a power source and wire.
B. Clothes stick together when they are taken out of a dryer.
D. A bolt of lightning strikes a lightning rod during a thunderstorm.
E. A person's hair stands up after being combed on a dry winter day.
500
A student builds two circuits to light a bulb. In the first circuit, the bulb lights. In the second circuit, the student replaces one metal wire with a piece of plastic, and the bulb does not light. What is the BEST explanation for why the second bulb does not light?
A. Plastic absorbs the electricity from the battery
B. Plastic increases the amount of electricity in the circuit
C. Plastic is an insulator that does not allow electricity to flow through the circuit
D. Plastic causes the battery to stop working
C. Plastic is an insulator that does not allow electricity to flow through the circuit
500
Electricity flows when electrons move through materials that allow the flow of electrical energy. Which situation would BEST allow electricity to travel through a circuit and light a bulb?
A. A battery connected to a bulb with metal wires forming a complete loop
B. A battery connected to a bulb with plastic pieces between the wires
C. A battery placed next to a bulb without wires
D. A bulb connected with wooden sticks instead of wires
A. A battery connected to a bulb with metal wires forming a complete loop
500
A student tests four materials in a circuit: copper wire, aluminum foil, plastic, and rubber. The light bulb lights when copper and aluminum are used but stays off when plastic and rubber are used. Which statement BEST compares the role of conductors and insulators in this investigation?
A. Conductors allow electrons to move through the circuit, while insulators block or slow the movement of electrons
B. Conductors store electrical energy, while insulators create electrical energy
C. Conductors and insulators both increase the amount of electricity in a circuit
D. Conductors stop the circuit from working, while insulators complete the circuit
A. Conductors allow electrons to move through the circuit, while insulators block or slow the movement of electrons