Powering an electrical device with a battery requires a path for electricity to flow through a closed circuit, and electrons flow continuously in a closed circuit. Given these facts, powering an electrical device with a battery requires a path for electrons to what among the following options:
- hydrogen and oxygen
 - spread out
 - electromagnetic energy
 - cut the line
 - flow continuously
 - an electron microscope
 - flood
 - kinetic energy


 

     flow continuously    