Cambridge Checkpoint Science 9: Electricity

The student's hair is standing up when he is touching a "Van de Graaf" generator because

• it makes it easier for his mother to give him a "coronavirus lockdown" haircut

• positive charges have moved into his hair from the generator

• positive charges have move into the generator away from his hair

• negative charges have moved into his hair from the generator

• negative charges have moved into both his hair and the generator

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What type of charged objects REPEL each other when brought close together?

(Choose all that apply)

• north and south

• positive and positive

• negative and positive

• negative and negative

• north and north

Tags

NGSS.HS-PS2-4

What force causes an object to become charged when it is rubbed?

• Electrostatic Force

• Coulomb's Force

• May the Force

• Friction Force

• Magnetic Force

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NGSS.HS-PS2-4

When a balloon is rubbed on your hair, both become charged because

• positive charges are transferred from one object to another

• electrons are transferred from one object to another

• both objects gain positive charges

• both objects gain electrons

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NGSS.MS-PS2-3

The unit of electrical charge is the

• Volt

• Ampere

• Coulomb

• Ohm

• Joule

Tags

NGSS.HS-PS2-5

If you are caught in the open outside during a thunderstorm, the safest measure to take is to:

• use an umbrella

• stand under the nearest tree

• make yourself as low as possible

• take a selfie of yourself with lightning in the background

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How is a conductor different from an insulator?

• A conductor works with an orchestra, whereas an insulator works on a building site

• Electric charges move freely on insulators but not with conductors

• Conductors have electrons; insulators do not

• Conductors do not have free electrons, but insulators do, so the electrons can move easily in insulators

• In a conductor, electric current can flow freely; in an insulator, it cannot flow freely

Which way do electrons flow?

• From negative to positive

• From positive to negative

• from negative to negative

• From positive to positive

The unit used to measure electric current

• Ohms

• Ampere

• Coulomb

• Ammeter

• Volt

Tags

NGSS.HS-PS2-5

In a closed circuit, what actually happens when current flows?

• electrons leave the cell, quickly rush through the circuit, then go back to the cell

• positive charges leave the cell, quickly rush through the circuit, then go back to the cell

• electrons in the circuit are "pushed" from the negative end, and attracted to the positive end of the cell.

• positive charges in the circuit are "pushed" from the positive end, and attracted to the negative end of the cell.

Tags

NGSS.HS-PS2-5