Question

A flash of lightning carries $10C$ Of charge which flows for $0.01s$. What Is the current? If the voltage Is $10mV$, What Is the energy?

Answer 1

Step 1: Given data-

Charge $\left(Q\right)=10C$

Time $\left(t\right)=0.01s$

Voltage $=10milliV=10\times {10}^{-6}V$

Step 2: Formula used-

Current =$\frac{Q}{t}$, where $Q$ is the charge and $t$ is the time.

Potential difference (voltage)= $\frac{Workdone\left(energy\right)}{charge}$

Step 3: Calculating current

Let us first calculate the current:

Current =$\frac{Q}{t}$=$\frac{10}{0.01}=1000A$

Now, we know that:

Energy =voltage $\times$charge

On substituting the values in the given formula, we get:

$$\begin{gathered} =10\times {10}^{-6}\times 10 \\ =100\times {10}^{-6} \\ =100milliJ \end{gathered}$$

Therefore current would be $1000A$ and the energy would be $10milliJ$.