RC Time Constant Calculator Card using Tailwind CSS & JavaScript

Last Updated : 08 Mar, 2024

The RC Time Constant Calculator is a web application designed to calculate the time constant (τ) of a resistor-capacitor (RC) circuit. It allows users to input the resistance and capacitance values of the circuit and then calculate the time constant based on these inputs. The calculator is designed with a clean and intuitive interface using the Tailwind CSS.

Approach to create RC Constant Time Calculator:

Integrate the Tailwind CSS via CDN Link in an HTML file. Tailwind CSS classes like bg-gray-100, p-8, rounded, shadow-lg, etc., are used for styling elements in the document. Input fields for resistance and capacitance values.
JavaScript code is included within <script> tags at the end of the body section. Calculation of the time constant (τ) based on resistance and capacitance values entered by the user. Error handling for invalid inputs.
Event listeners are attached to the “Calculate” button. When the “Calculate” button is clicked, the calculateTimeConstant the function is invoked.
Inside calculateTimeConstant, the resistance and capacitance values are retrieved from the input fields, and if they are valid, the time constant is calculated and displayed. If not, an error message is shown.

Example: Illustration of designing an RC Time Constant Calculator in Tailwind CSS

HTML

<!DOCTYPE html>
<html lang="en">
 
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, initial-scale=1.0">
    <title>The RC Time Constant Calculator</title>
    <script src="https://cdn.tailwindcss.com"></script>
</head>
 
<body class="bg-gray-100 flex items-center 
             justify-center h-screen">
    <div class="max-w-md w-full bg-white p-8 rounded-lg
                shadow-lg border-2 border-green-500">
        <h1 class="text-3xl font-bold text-center mb-8">
              RC Time Constant Calculator
          </h1>
        <div class="mb-4">
            <label for="resistance"
                   class="block text-gray-700 mb-2">
              Resistance (Ω):
              </label>
            <input type="number" id="resistance"
                   class="w-full border border-gray-300 rounded-md
                          py-2 px-3 focus:outline-none 
                          focus:border-blue-500"
                   placeholder="Enter resistance">
        </div>
        <div class="mb-4">
            <label for="capacitance"
                   class="block text-gray-700 mb-2">
              Capacitance (F):
              </label>
            <input type="number" id="capacitance"
                   class="w-full border border-gray-300 rounded-md
                          py-2 px-3 focus:outline-none 
                          focus:border-blue-500"
                placeholder="Enter capacitance">
        </div>
        <div class="flex justify-center mb-4">
            <button id="calculate"
                       class="w-full bg-blue-500 text-white rounded-md
                           py-2 px-4 hover:bg-blue-600 
                           focus:outline-none">
              Calculate Time Constant
              </button>
        </div>
        <div id="result" class="text-center text-lg font-semibold"></div>
        <div id="errorMessage" class="text-red-500 
                                      text-sm mt-2 hidden">
              Please enter valid resistance and capacitance values.
          </div>
    </div>
    <script>
        const calculateButton = document.getElementById('calculate');
        const autoCalculateCheckbox = document.getElementById('autoCalculate');
        const resistanceInput = document.getElementById('resistance');
        const capacitanceInput = document.getElementById('capacitance');
        const resultDisplay = document.getElementById('result');
        const errorMessage = document.getElementById('errorMessage');
        calculateButton.addEventListener('click', calculateTimeConstant);
        autoCalculateCheckbox.addEventListener('change', toggleAutoCalculate);
        function calculateTimeConstant() {
            const resistance = parseFloat(resistanceInput.value);
            const capacitance = parseFloat(capacitanceInput.value);
            if (isNaN(resistance) || isNaN(capacitance)) {
                errorMessage.classList.remove('hidden');
                resultDisplay.textContent = '';
            } else {
                const timeConstant = resistance * capacitance;
                resultDisplay.textContent = `Time Constant (τ) =
                        ${timeConstant.toFixed(2)} seconds`;
                errorMessage.classList.add('hidden');
            }
        }
        function handleInput() {
            calculateTimeConstant();
        }
    </script>
</body>
 
</html>