Electric Current and Conductivity Quiz

What are free electrons and how do they contribute to electrical conductivity?

• Electrons that are only found in insulators

• Electrons that are stationary and do not contribute to conductivity

• Electrons that are loosely bound and can move freely, enabling conductivity

• Electrons that are tightly bound to atoms, preventing conductivity

Which of the following materials is a good conductor of electricity?

• Rubber

• Wood

• Copper

• Plastic

What is the main difference between conductors and insulators?

• Conductors allow free flow of electrons, while insulators do not

• Conductors are always metals, insulators are always non-metals

• Conductors have no electrons, insulators have many electrons

• Conductors are used in batteries, insulators are not

How is the direction of conventional current defined?

• In the direction of magnetic field lines

• In the direction of electron flow

• Opposite to the direction of positive charge movement

• In the direction of positive charge movement

Why is the direction of conventional current opposite to electron flow?

• Due to historical definitions before electrons were discovered

• Because current flows in a vacuum

• Because electrons are positively charged

• Because electrons move faster than protons

What is the SI unit of electric current?

• Ohm

• Volt

• Coulomb

• Ampere

If 1 Coulomb of charge passes through a conductor in 1 second, what is the current?

• 1 Joule

• 1 Ohm

• 1 Volt

• 1 Ampere

How is electric current calculated using charge and time?

• Current = Charge x Time

• Current = Charge / Time

• Current = Time / Charge

• Current = Charge + Time

In a circuit, if the current is 0.5 Ampere and it flows for 1 hour, how much charge passes through?

• 7200 Coulombs

• 0.5 Coulombs

• 3600 Coulombs

• 1800 Coulombs

How many electrons pass through a bulb if a current of 64 milliampere flows for 10 minutes?

• 48 x 10^19 electrons

• 12 x 10^19 electrons

• 64 x 10^19 electrons

• 24 x 10^19 electrons