Answer:
Since there are no choices provided, I have answered the question according to my understanding.
free electrons
Step-by-step explanation:
When it comes to electric currents, there are certain things or objects that allows it to flow. These things are known as "conductors." What sets conductors apart from insulators (poor conductors of electricity) is its ability to let the electric current flow through them. This is because of the "free electrons" they have within them. These electrons are able to move from one atom to the other when an electric field is present.
So, this explains the answer.