Electrical Conductivity and Circuit Components Quiz

Which property of metals BEST explains their ability to conduct electricity?

• The presence of free electrons in their structure
• Their shiny appearance
• Their ability to be hammered into sheets
• Their high melting points

In a copper wire covered with plastic insulation, what is the PRIMARY function of the plastic covering?

• To make the wire look attractive
• To prevent electrical shock and short circuits
• To make the wire stronger
• To increase conductivity

What happens to the electrons in a copper wire when resistance increases?

• They move faster
• They collide more frequently with atoms
• They disappear completely
• They change color

How does electric current differ from voltage?

• Current is the flow of electrons while voltage is the pressure driving them
• Current is measured in volts while voltage is measured in amperes
• Current flows through insulators while voltage flows through conductors
• Current is potential energy while voltage is kinetic energy

What effect does high resistance have on current in an electrical circuit?

• It increases current flow
• It decreases current flow
• It has no effect on current
• It reverses current direction

In what direction do electrons actually flow in an electrical circuit?

• From positive to negative
• From negative to positive
• In both directions simultaneously
• They don't flow at all

Why are copper wires commonly used in electrical circuits?

• Because copper is cheap
• Because copper has low resistance and is a good conductor
• Because copper is easily available
• Because copper looks attractive

What would happen if you removed the plastic insulation from two adjacent wires in a circuit?

• The circuit would work better
• Nothing would happen
• A short circuit could occur
• The resistance would increase

How does voltage relate to the movement of electrons in a circuit?

• It provides the electrical pressure to move electrons
• It stops electrons from moving
• It has no effect on electron movement
• It changes electrons into protons

What is the relationship between resistance and current in a circuit?

• They are directly proportional
• They are inversely proportional
• There is no relationship
• They are always equal