Electricity, Motors, & Generators

You want to increase the brightness of a lightbulb in a series circuit. Choose the 2 answers that are correct to increase the brightness of a lightbulb in a circuit.

• Increase the battery size from 9V to 12V
• Decrease the number of lightbulbs which will decrease resistance
• Decrease the battery size from 12V to 9V
• Increase the number of lightbulbs which will increase resistance

The following are four different arrangements of bar magnet pairs on a table near each other. Which arrangement of a pair of bar magnets on the left will attract each other? (pick 2)

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

The two magnets were placed near each other on a tabletop. Which statement about the magnetic force of these two magnets is false?

• The south and north poles of two magnets will be attracted to each other.
• The two north poles of the magnets will repel each other.
• There will be a magnetic field between the magnets.
• The magnetic forces will electrically charge the magnets.

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

The figure shows an iron nail with a coil of wires around it. The wires are connected to a battery. The rod has a magnet around it. What will happen to the nail when current flows through the wire?

• The iron nail will quickly melt.
• The iron nail will spin.
• The nail and wires will become a magnet.
• Nothing will happen to the nail.

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NGSS.MS-PS2-5

(One word fill-in-the-blank) The device pictured here is best described as a(n) _______________.

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NGSS.MS-PS2-3

Choose which three (3) parts when put together would make the strongest electromagnet. (You must choose 3.)

• Iron Bar
• 7 wire coils
• Four 9-Volt batteries
• Wood Bar
• Glass Bar

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NGSS.MS-ETS1-1

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As long as an electric current flows through a coil of wire, a magnetic field exists around the coil. What happens to the magnetic field when the electric current suddenly turns off?

• The magnetic field gradually gets stronger
• The magnetic field reverses direction
• The magnetic field stays the same because the coil becomes magnetized
• The magnetic field suddenly disappears

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NGSS.HS-PS2-5

Choose the following statement that best finishes the statement "A generator..."

• Creates mechanical energy from electrical energy.
• Creates chemical energy from mechanical energy.
• transforms mechanical energy into electrical energy.
• transforms electrical energy into mechanical energy.

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NGSS.HS-PS3-3

Motors and generators contain the same parts. In both, a coil of wire is placed in a magnetic field. Which of the following statements about motors and generators is correct?

• In a motor, the coil of wires is mechanically turned, producing a current.
• In a generator, a current is passed through a coil of wires, causing it to rotate.
• A motor rotates in only one direction producing alternating electricity.
• A generator uses electromagnetic induction to produce electricity.

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NGSS.MS-PS3-5

Two students are driving along the highway when they see a nuclear power plant. "That is a nuclear power plant, and it generates energy for our city," points out one of the students. What is the energy transformation chain? ​ (a)   produced through nuclear fission ----> ​ (b)   boils water to produce steam ----->​ (c)   steam turns a turbine ----> ​ (d)   is transmitted by cables to homes

• Nuclear Energy
• Thermal Energy
• Mechanical Energy
• Electrical Energy
• chemical energy

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NGSS.HS-PS3-2

NGSS.HS-PS3-4