Current

A car battery is rated at 80 A×h. An ampere-hour is a unit of: 

• power 
• energy 
• current
• charge

Current has units: 

• kilowatt·hour 
• ampere 
• coulomb 
• volt 

A 60-watt light bulb carries a current of 0.5 ampere. The total charge passing through it in one hour is: 

• 3600 C
• 3000 C 
• 2400 C
• 1800 C 

Current in a conductor is normally due to:

• the collective motion of all electrons in the conductor
• the thermal motion of the conduction electrons
• the drift motion of the conduction electrons due to electric fields
• the drift motion of both electrons and positrons

In schematic diagrams, currents are indicated using arrows. What do the arrows indicate?

• the direction of motion of the electrons
• the direction of the current vector
• the direction of motion of the charge carriers
• the direction that positive charge carriers would move

This figure shows a junction. What is true of the currents?

• i₁ = i₀ + i₂
• i₂= i₀ + i₁
• i₀ = i₁ – i₂
• i₁ = i₀ – i₂

A 10-ohm resistor has a constant current.  If 1200 C of charge flow through it in 4 minutes what is the value of the current?

• 3.0 A
• 5.0 A
• 20 A 
• 120 A

Current is a measure of: 

• force that moves a charge past a point 
• resistance to the movement of a charge past a point 
• energy used to move a charge past a point 
• amount of charge that moves past a point per unit time 

Current has units: 

• kilowatt·hour 
• coulomb/second
• coulomb 
• volt

Conduction electrons move to the right in a certain wire.  This indicates that:

• the current density and electric field both point right
• the current density and electric field both point left
• the current density points right and the electric field points left
• the current density points left and the electric field points right