Question

What is the charge of an electron? How many electrons make a coulomb of charge?

Answer 1

The charge of an electron is $1.6\times {10}^{-19}$ coulombs
Step 1: Given data

$q=1C$

We know that charge of one electron, $e=$$1.6\times {10}^{-19}$C

Let $n$ be the number of electrons

Step 2 : Calculating the number of electrons in a coulomb of charge

Using $q=ne$ formula

$1C=n\times 1.6\times {10}^{-19}C$

$$\begin{gathered} n=\frac{1}{1.6\times {10}^{-19}} \\ n=6.25\times {10}^{18} \end{gathered}$$

Hence,

1. The charge of an electron is $1.6\times {10}^{-19}$ coulombs.

2. $6.25\times {10}^{18}$electrons make a coulomb of charge.