How to create a volts to electronvolts (eV) converter using JavaScript, you can use the following code:
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Volts to Electronvolts (eV) Converter</title>
</head>
<body>
<h1>Volts to Electronvolts (eV) Converter</h1>
<label for="volts">Enter Voltage (V): </label>
<input type="number" id="volts">
<button onclick="convert()">Convert</button>
<p id="result"></p>
<script>
function convert() {
// Get the voltage value
let volts = document.getElementById('volts').value;
// Check if the input is valid
if (isNaN(volts) || volts <= 0) {
document.getElementById('result').innerHTML = "Please enter a valid positive number for voltage.";
return;
}
// Convert volts to electronvolts
let electronVolts = volts * 6.242e18;
document.getElementById('result').innerHTML = `Result: ${volts} Volts is approximately ${electronVolts.toFixed(2)} eV.`;
}
</script>
</body>
</html>
In this code:
1. We have an input field where the user can enter the voltage in volts (V).
2. When the user clicks the “Convert” button, the `convert()` function is called.
3. The `convert()` function retrieves the voltage value, checks if it’s a valid positive number, and then calculates the electronvolts using the conversion factor of 6.242 × 10^18 (eV/V).
4. Finally, the result is displayed to the user.