# Lightning discharge time 3ms. The current strength in the lightning channel

**Lightning discharge time 3ms. The current strength in the lightning channel is about 30 kA. What charge passes through the lightning channel?**

It is known that the lightning discharge time is t = 3 ms = 0.003 s. In this case, the current strength in the lightning channel is about I = 30 kA = 30,000 A. To determine which charge q passes through the lightning channel during this time, we will use the definition of the concept of current strength as a charge passing through the cross section per unit of time:

I = q / t, then we get:

q = I ∙ t.

Let’s substitute the values of physical quantities in the calculation formula and find the amount of electric charge carried by lightning:

q = 30,000 A ∙ 0.003 s;

q = 90 Cl.

Answer: a charge of 90 C passes through the lightning channel.