4a Electricity and Conductivity Quiz

What is the unit of electric current?

• Coulombs

• Ampere

• Electronvolts

• Ohms

In a semiconductor, what band is responsible for electron conduction?

• Valence band

• Conduction band

• Semiconductor band

• Superconductor band

What unit is used to measure electric charge?

• Coulombs

• Ampere

• Electronvolts

• Joules

What does Ohm's law state?

• Voltage is directly proportional to current

• Voltage is inversely proportional to current

• Current is directly proportional to resistance

• Current is inversely proportional to resistance

Conduction electrons are best described as:

• Electrons that move freely in a conductor

• Electrons confined to a specific atom

• Electrons with high potential energy

• Electrons with low mobility

The formula for voltage (V) is:

• V=IR

• V=I/R

• V=Q/t

• V=W/q

Which of the following represents the intensity-potential graph of semiconductor diodes?

• Exponential increase

• Linear increase

• Linear decrease

• Exponential decrease

What is a characteristic of an insulator?

• High conductivity

• Low resistance

• Few free electrons

• Low resistivity

What is the formula for electromotive force (EMF)?

• EMF=IR

• EMF=I/R

• EMF=Q/t

• EMF=W/q

Ionic charge carriers are commonly found in:

• Conductors

• Semiconductors

• Insulators

• Superconductors