Concuctors

When touched by the free ends of the wires, ____________ will complete the circuit and make the bulb glow.

• a needle

• a piece of paper

• a plastic ruler

• a sheet of paper

Which material BEST allows electricity to pass through it?

• graphite

• rubber

• styrofoam

• wood

Electricians wear rubber gloves when working with electric lines. Which statement BEST explains why?

• for protection from hot surfaces

• to get a better grip on their tools

• to avoid getting rust on their fingers

• for protection against electrical shock

Alan's lamp stops working. He notices that the chord of the lamp is broken. He ties the wires back together, but notices that some wire remains exposed. Alan correctly identifies that this is an unsafe situation. Which material would be best for patching (surrounding) the broken cord?

• aluminum foil

• copper wire

• steel wool

• duct tape

Conductors are materials that allow electricity to flow through them. What is an example of a conductor?

• paper

• plastic straw

• metal staple

• crayon

Insulators are materials that stop the flow of electricity. Which of these is an example of an insulator?

• nail

• metal staple

• crayon

• paper clip

Aluminum foil, cast iron pans, copper pipes, graphite, and sea water can be classified as

• insulators because free electron flow is hindered by the structure of the material.

• conductors because electrons can move freely from one atom to another creating a current.

• superconductors because they provide no resistance to electron flow through the material.

• semiconductors because electron movement is dependent on the conditions - such as temperature and voltage.

Tags

NGSS.MS-PS2-3

A student is making a circuit to turn on a lightbulb with a switch. The student uses a wooden toothpick to replace one of the wires in the circuit. Will the lightbulb light?

• No, the switch is not closed.

• No, the lightbulb filament is broken.

• No, the toothpick is an insulator.

• Yes, the toothpick is a suitable replacement for a wire.

Tags

NGSS.MS-PS1-2

The diagram shows an incomplete circuit due to a break in the wire at point X. A student is testing materials to see if they conduct electricity. The student places each item in Location X, making sure the object is in contact with the loose end of each wire. Which item will electricity flow through causing the bulb to light?

• A crayon

• A sheet of notebook paper

• A penny

• A rock

Tags

NGSS.MS-PS2-3

A student made a list of household items that conduct electricity, and items that do not. Which item below is correctly classified as a conductor or insulator?

• Fabric dog collar: conductor

• Glass bead: conductor

• Plastic spoon: insulator

• Lamp wire: insulator

Tags

NGSS.MS-PS2-3