Current

Current

• It is important to understand the physics of current flow in conductors to appreciate the innovation of new electronic devices. 

• An electric current is a flow of electric charge. In electric circuits, this charge is often carried by moving electrons in a wire.

• It can also be carried by ions in an electrolyte, or by both ions and electrons such as in an ionized gas (plasma).

• We can measure it using the ammeter.

• We also represent it by letter(i).

• When we say that “electrons flow through a conductor,” what we mean is that the conductor’s constituent atoms freely give up electrons from their outer shells. 

• Flow means that electron jump from an atom to another, (jumping into an empty hole).

• In some materials, particularly certain semiconductors, current flow is actually due to holes.

• We can found this flow of current also in the Nerve cells in your brain.