What is a Circuit?

A closed path through which an electrical current can flow is called a Circuit.

Electrons with a negative charge, can not just jump through the air to a positively charged atom. They have to wait until there is a link or bridge between the negative area and the positive area. This also means, a Circuit.

When a bridge is created, the electrons begin moving quickly. Depending on the resistance of the material making up the bridge, they try to get across as fast as they can. But, too many electrons could go across at one time and destroy the circuit, in the process.

When we limit the number of electrons that can cross over our circuit, we call it, Resistance. Before electrons can move far, they can collide with one of the atoms along the way. This slows them down or even reverses their direction. Therefore, they lose energy to the atoms. This energy to the atoms. This energy appears as heat, and the scattering is a resistance to the current.