Electricity and Magnetism Review

Seongho builds a simple circuit to light up a light bulb. His design is shown in the diagram. The light bulb in Seongho's circuit does not light up. Which BEST describes the reason?

• A. A switch is needed to allow energy to flow through the circuit.

• B. The circuit is missing a power source to provide energy to the battery.

• C. A second wire needs to connect the other side of the battery to the light bulb.

• D. The wire needs to run from the positive end of the battery instead of the negative end.

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NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

Maahir wants to create a circuit to light up a bulb. He has a copper wire and a light bulb. What else does he need?

• a power source like a battery

• a wire that can conduct electricity

• a switch that will turn the power on and off

• an insulator that will stop the flow of electricity

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NGSS.MS-ETS1-1

Mrs. Sinha takes a load of clothes out of the dryer. She notices that a pair of socks are stuck together. When she separates the socks, she feels a small shock and hears a crackling sound. Is this an example of static electricity or human-harnessed electricity?

• This is an example of static electricity which resulted from the steady flow of charge that is constantly moving through the socks.

• This is an example of static electricity which resulted from the build up of electric charges on the socks when they were tossed around in the dryer.

• This is an example of human-harnessed electricity which resulted from the steady flow of charge that is constantly moving through the socks.

• This is an example of human-harnessed electricity which resulted from the build up of electric charges on the socks when they were tossed around in the dryer.

Which statement correctly compares a bar magnet to an electromagnet?

• A. Bar magnets are stronger.

• B. Electromagnets are adjustable.

• C. Bar magnets are temporary magnets.

• D. Electromagnets are permanent magnets.

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NGSS.MS-PS2-3

Liam is designing an investigation using a magnetic wand. His initial set up is shown.

• He can use a longer rod to observe if the magnetic field strength of the wand will increase.

• He can use fewer paper clips to observe if the magnetic field strength of the wand will increase.

• He can use different colors of paper clips to observe which color will be attracted to the magnetic field of the wand the fastest.

• He can place different objects between the wand and the paper clips to observe how much of the magnetic field passes through them.

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NGSS.MS-PS2-3

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Zeyna plans an investigation with magnets. Her experimental procedure is shown. Step 1: Test the attractive properties of a small, circular permanent magnet by placing it on a refrigerator door. Step 2: Place a square of paper that is 3 millimeters thick between the magnet and the refrigerator and observe if the magnet is attracted to the refrigerator. Step 3: ? What could the student do at step 3 to demonstrate how a magnetic field's strength can change?

• use different amounts of water to moisten the paper

• use increasing thicknesses of paper

• use smaller squares of paper

• use different textures of paper

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NGSS.MS-PS2-5

Which describes the role of the paperclip in this diagram?

• It keeps the circuit open.

• It conducts electricity.

• It powers the circuit.

• It lights the bulb.

What does the word 'illuminate' mean? Fill in the blank: To illuminate means ________.

• to light up or make something bright

• to make something smaller

• to cover something up

• to make something disappear

David was studying types of electricity in Science class. Electricity Type A: Definition of Lightning from James’s Dictionary: the occurrence of a natural electrical discharge of very short duration and high voltage between a cloud and the ground or within a cloud, accompanied by a bright flash and typically also thunder. Electricity Type B: Definition of Lamp from James’s Dictionary: a device for giving light, either one consisting of an electric bulb together with its holder and shade or cover, or one burning gas or a liquid fuel and consisting of a wick or mantle and a glass shade. Which BEST explains the difference between the electricity illustrated in the two pictures?

• A. Electricity type A is human-harnessed electricity that cannot be turned on and off, but electricity type B occurs naturally and can be turned on and off.

• B. Electricity type B is human-harnessed electricity that can be turned on and off when needed, but electricity type A occurs naturally and cannot be turned on and off.

• C. Both electricity type A and electricity type B are examples of human-harnessed electricity because they are created by humans and easily controlled by humans.

Lightning is not an example of human-harnessed electricity and is not created or easily controlled by humans.

• True

• False