Inv4.Exp3 TextA (pg.183-187)

What is a conductor?

• A material where electrons cannot move easily

• A material containing electrons or charged ions that can move easily through it

• A device used to measure electric current

• A type of insulator

Which of the following is an example of a conductor?

• Covalent solid

• Ionic solution

• Rubber

• Glass

What is an insulator?

• A type of metal

• A material in which electrons can move freely

• A device that prevents the flow of electric current

• A material in which electrons cannot move easily

Why are metals considered good conductors?

• They are always in a liquid state

• They have delocalized electrons

• Their electrons are tightly bound to atoms

• They have high resistance

What are delocalized electrons?

• Electrons that are not associated with a single atom or a covalent bond

• Electrons that can only move in insulators

• Electrons that are tightly bound to a particular atom

• Electrons that are stuck in localized chemical bonds

What is cold welding?

• A welding technique that uses liquid nitrogen

• A process of joining two metals together without heat

• A process of joining two metals together using high heat

• A type of welding that only occurs in cold temperatures

Why does cold welding not happen in air?

• Because the electrons cannot move in air

• Because of the presence of oxide layers, dirt, and grease on the surfaces

• Because the air temperature is too high

• Because metals cannot bond in the presence of oxygen

What is the drift velocity?

• The maximum speed electrons can achieve in a conductor

• The velocity of electrons in an insulator

• The speed at which a conductor can conduct electricity

• The constant average velocity of electrons due to an electric field

What is the unit for electric current?

• Volt (V)

• Watt (W)

• Coulomb (C)

• Ampere (A)

What does electric current measure?

• The resistance of a wire

• The rate at which charge passes through an area of wire

• The temperature of a wire

• The rate at which voltage passes through an area of wire