# What determines the strength of the current?

Electric current is the movement (ordered) of charged particles. An electric current occurs when moving free ions or electrons. Zero is the total charge carried across the conductor section. As the charges of different signs move with the same average speed. Electric current has a certain direction. The direction of the current is the movement of positively charged particles.

## What is current strength

We do not see how the particles move in the conductor. The fact that there is an electric current, say the following phenomena or actions that accompany it:

- heats the conductor through which current flows;
- from the effects of electric current may change the chemical composition of the conductor;
- the current can affect magnetized bodies and neighboring currents.

The strength of the current is a scalar. It is equal to: I = q / t, where: current strength - I; electric charge - g; time interval - t; There is a positive and negative current. Current depends on:

- charge, which is transferred by each particle (q0);
- particle concentrations (n);
- particle velocity (v);
- conductor area (s);

That is, I = (q0) nvS The strength of the current, in the international system of units, is expressed in amperes (A). Ammeters measure current.

### Electric current conditions

- the presence of charged (free) particles;
- the electric field must be intense;
- the DC circuit must be closed;
- the charged particles must be affected by the force ensuring their orderly movement.

Induction current is a current that occurs in a closed (conducting) circuit, in the case when the flux of magnetic induction changes. The directions of the induction current and the magnitude are determined by the Lenz rule and the law of electromagnetic induction. So, the strength of the induction current depends on how the speed of the magnetic flux changes. That is, if the magnetic flux changes very quickly, then there are much more forces on the induction current.

Now you know what determines the strength of the current. Apply this knowledge in practice.