Calculate the number of electron volts in one joule.

Explanation

To calculate the number of electron volts in one joule, we can follow these steps:

### Step 1: Understand the definition of an electron volt
An electron volt (eV) is defined as the amount of energy gained by an electron when it is accelerated through a potential difference of 1 volt. Mathematically, it can be expressed as:
\[ 1 \, \text{eV} = 1 \, \text{electron charge} \times 1 \, \text{volt} \]

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