How does current flow?
The question of what is an electric current, even small children are interested. They are frightened from childhood with terrible rosettes that can strike. But even many adults do not understand in which direction the current flows and how. Let's go through this article and try to figure it out.
First, let's understand what it is - an electric current. The composition of the molecules includes elementary, negatively charged particles. They are called electrons. Current is called their directed movement. In this or that material there are free electrons. Their presence determines its electrical conductivity.
Voltage is a potential difference. The directional movement of electrons occurs when it is present. In the absence of a potential difference, free electrons will be at rest, and there will be no electric current. But, as soon as tension is connected to the material, they will begin their movement. The electrons will be repelled by the minus, and move towards the plus.Therefore, answering the question of how current flows in a conductor, we say - from minus to plus. This movement will be called electric current.
Simply put, until an electric device is included in the circuit, that is, until a potential difference arises in it, the current in it will not flow. According to this principle, all conductors of electricity and work. But, in materials such as rubber, wood, glass, and many others, there are no free electrons. Even when voltage is connected to them, they will not conduct current.
Now the questions of your children about how current flows, you will know what to answer. Remember to remind them that you should be careful with electrical appliances.