PS

Electric circuits provide energy for lightbulbs. Which of these prevents the flow of electrons?

• a circuit that is closed

• a series circuit

• a circuit that is open

• a parallel circuit

Which labeled element in the circuit represents a resistor?

• P

• Q

• R

• S

After rubbing a rubber brush on wool, Gilbert is able to use the brush to pick up small strips of paper. What causes the paper to be attracted to the brush?

• gravity

• electric current

• static electricity

• magnetism

During a thunderstorm, Charles watched flashes of lightning through his window. Which process best describes the cause of the lightning?

• chemicals from different clouds combining to release energy

• radioactive atoms in the atmosphere exploding between clouds

• heat energy jumping between warmer clouds and colder clouds

• charged particles moving between positively and negatively charged parts of clouds

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

A magnet can generate an electric current in a wire if the magnet is close enough to the wire and if the magnet is also

• strong.

• weak.

• at rest.

• in motion.

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

A magnetic field will be detected near this circuit only if

• the wire is made of iron.

• a current flows through the wire.

• the wire is cooled first.

• the battery contains acid.

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

Would increasing the number of batteries in a circuit that is connected to a small electric motor affect the speed of the motor, if all other variables are kept constant?

• No, because it is the magnetic force, not the electric force, that controls the motor speed.

• Yes, the motor would run faster because the increased electrical force increases the magnetic force in the motor.

• No, the speed of a motor is controlled only by the number of wire coils in the motor.

• Yes, the motor would run faster because increased current causes the motor to become warmer.

A device that converts mechanical energy into electricity is a

• generator.

• meter.

• motor.

• solenoid.

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NGSS.MS-ETS1-1

What will most likely happen when the switch is closed?

• A magnetic field should be produced.

• The iron in the nail should break down.

• The battery’s charge should be depleted.

• Rusting should be immediately observed.

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NGSS.MS-PS2-3

Which property of the metal is being tested with this setup?

• luster

• density

• elasticity

• conductivity