What characteristic of electricity is expressed in watts?

• the amount of work required to move electrons through a circuit
• the resistance to the flow of current in a circuit
• the amount of electrons flowing through a circuit per second
• the work required to move electrons through a circuit multiplied by the number of electrons flowing through a circuit per second
  

  Explanation: Watts is the unit used to measure the electrical power. Power refers to the work required to move electrons through a circuit multiplied by the number of electrons flowing through a circuit per second.