# In a lightning strike, a charge of 18 coulombs is transferred in 0.02 seconds at a potential...

## Question:

In a lightning strike, a charge of 18 coulombs is transferred in 0.02 seconds at a potential difference of 1,500,000 volts. What is the average current?

## Electric Current:

Electric current is a measure of the flow of charge through a given point with time. That is, electric current is the charge flowing per unit time. The current has unit symbol, A.

By definition average electric current is average amount of charge per unit time;

{eq}\begin{align*} Average\ Current &= \frac{\Delta Q}{\Delta t} & \text{[Q is the amount of charge, t is the time]}\\ &= \frac{18\ C}{0.02\ s}\\ &= 900\ C/s\\ &= 900 A \end{align*} {/eq}

The average current is 900 A.