S5P2 Electricity

Why are electrical cords often covered with rubber?

• To slow the flow of electrons to keep them on the electric circuit to prevent a fire.

• To keep the wires from breaking apart.

• To keep wire from getting wet.

• So that you can determine what color goes where.

When looking for a location to build a hydroelectric plant, a necessary requirement for generating power is?

• access to the heat in the Earth

• a large number of lakes

• a source of moving water

• organic plant and animal remains

Tags

NGSS.HS-ESS2-5

Which of the following correctly describes one way in which static electricity is different from the electricity used by humans to run things in their homes?

• Static electricity is a quick release of energy.

• Static electricity is not a form of energy.

• Static electricity flows at a constant rate.

• Static electricity always goes in the same direction.

A group of students hang a balloon with an electrical charge from the ceiling with a string. They bring another balloon near the first one. Predict what will happen when the balloons are brought closer together. The balloon on the string will?

• move upward if the charges are opposite.

• remain still if the charges are opposite.

• move downward if it loses its charge.

• move away if the charges are the same.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which statement supports that electricity can be very dangerous to humans?

• It keeps us in contact with others who may live far away.

• Inventors need to create something that could be put between humans and the flow of electricity.

• Conductors are usually made from wire.

• Our bodies are good conductors.

Arlene rubs a glass rod with a piece of silk, then placed the rod near her head. Select two of the following statements that are correct about the experiment.

• The glass rod attracts Arlene's hair.

• The glass rod is neutral after being rubbed with silk.

• The glass rod causes Arlene's hair to become neutral.

• The glass rod and Arlene's hair have different charges

• The glass rod repels Arlene's hair.

Which of the following occurs due to static electricity?

• A steel ball falls vertically to the ground after it is released from a height.

• An iron nail moves toward a bar magnet after the two are placed close to each other.

• A laboratory cart rolls across the floor after it is pushed by a student.

• A plastic comb attracts a small piece of paper after it is used to comb someone's hair.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Alyssa wore a wool hat to school. When she took the hat off, her hair crackled and stood on end.

• The hat removed positive charges from Alyssa’s hair.

• Alyssa’s hair removed negative charges from the hat.

• Alyssa’s hair removed negative charges from the hat.

• The hat removed negative charges from Alyssa’s hair.

Tags

NGSS.MS-PS2-5

Which pair of items will repel each other?

• a negatively-charged plastic strip and a negatively-charged piece of cloth

• a negatively-charged balloon and a positively-charged piece of paper

• a positively-charged wool sock and a neutral plastic bag

• a neutral cotton sweater and a negatively-charged plastic pellet

Tags

NGSS.MS-PS2-3

A student rubbed a balloon with a wool cloth. The balloon developed a negative charge. The student placed the balloon against a wall and let go. The balloon stayed next to the wall for a few minutes, then fell. What is the MOST likely reason the balloon fell?

• The balloon gave up positive charges to the wall.

• he wall gave up negative charges to the balloon.

• The balloon gave up negative charges to the wall.

• The wall gave up positive charges to the balloon.

Tags

NGSS.MS-PS2-5