Amp Watt Volt Calculator

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Amp Watt Volt Calculator

Calculate electrical power (Watts), voltage (Volts), or current (Amps) using Ohm's Law.

Watts (W) Volts (V) Amps (A)

Result

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Understanding Ohm's Law and Electrical Calculations

The relationship between voltage (V), current (I), and resistance (R) in an electrical circuit is fundamental and described by Ohm's Law. A related and equally crucial law, the power law, describes the relationship between power (P), voltage (V), and current (I). This calculator helps you determine any one of these three electrical quantities if you know the other two, using the power law:

Power (Watts) = Voltage (Volts) × Current (Amps)

This formula, often written as P = V × I, is the basis for our calculations.

Key Electrical Units:

  • Volts (V): The unit of electric potential difference or electromotive force. It's the "pressure" that pushes electric charge.
  • Amps (A): The unit of electric current, representing the flow rate of electric charge.
  • Watts (W): The unit of electric power, which is the rate at which electrical energy is transferred or converted.

How the Calculator Works:

This calculator is designed to find one of the three primary electrical quantities (Volts, Amps, or Watts) when the other two are provided.

  • If you want to find Watts: Enter the known values for Volts and Amps. The calculator will multiply them to give you the power in Watts.
  • If you want to find Volts: Enter the known values for Watts and Amps. The calculator will divide Watts by Amps (V = P / I) to give you the voltage in Volts.
  • If you want to find Amps: Enter the known values for Watts and Volts. The calculator will divide Watts by Volts (I = P / V) to give you the current in Amps.

It's important to ensure that the values you input are accurate and relevant to the circuit or device you are analyzing. This tool is useful for electricians, hobbyists, engineers, and anyone working with electrical systems to quickly estimate power consumption, voltage requirements, or current draw.

For example, if a light bulb uses 60 Watts (W) of power and operates at a standard household voltage of 120 Volts (V), you can calculate the current it draws by entering these values. The calculator would then determine that the current (I) is 0.5 Amps (A), because 60W / 120V = 0.5A.

function calculateElectrical() { var calculateFor = document.getElementById("calculateFor").value; var voltsInput = parseFloat(document.getElementById("voltsInput").value); var ampsInput = parseFloat(document.getElementById("ampsInput").value); var powerInput = parseFloat(document.getElementById("powerInput").value); var resultValue = '–'; var resultUnit = '–'; var errorMessage = "; // Clear previous error messages document.getElementById("result-value").style.color = var(–primary-blue); // Reset to default color if (calculateFor === "watts") { if (!isNaN(voltsInput) && !isNaN(ampsInput)) { var calculatedWatts = voltsInput * ampsInput; resultValue = calculatedWatts.toFixed(2); // Display with 2 decimal places resultUnit = "Watts (W)"; } else { errorMessage = "Please enter valid numbers for Volts and Amps."; } } else if (calculateFor === "volts") { if (!isNaN(powerInput) && !isNaN(ampsInput)) { if (ampsInput === 0) { errorMessage = "Amps cannot be zero when calculating Volts."; document.getElementById("result-value").style.color = "red"; // Highlight error } else { var calculatedVolts = powerInput / ampsInput; resultValue = calculatedVolts.toFixed(2); resultUnit = "Volts (V)"; } } else { errorMessage = "Please enter valid numbers for Watts and Amps."; } } else if (calculateFor === "amps") { if (!isNaN(powerInput) && !isNaN(voltsInput)) { if (voltsInput === 0) { errorMessage = "Volts cannot be zero when calculating Amps."; document.getElementById("result-value").style.color = "red"; // Highlight error } else { var calculatedAmps = powerInput / voltsInput; resultValue = calculatedAmps.toFixed(2); resultUnit = "Amps (A)"; } } else { errorMessage = "Please enter valid numbers for Watts and Volts."; } } document.getElementById("result-value").innerText = errorMessage ? "Error" : resultValue; document.getElementById("result-unit").innerText = errorMessage ? errorMessage : resultUnit; } // Initial setup to show only relevant inputs function updateInputVisibility() { var calculateFor = document.getElementById("calculateFor").value; document.getElementById("wattsInputGroup").style.display = (calculateFor === "volts" || calculateFor === "amps") ? "block" : "none"; document.getElementById("ampsInputGroup").style.display = (calculateFor === "watts" || calculateFor === "volts") ? "block" : "none"; document.getElementById("powerInputGroup").style.display = (calculateFor === "amps") ? "block" : "none"; // Adjust input placeholders and clear values when switching if (calculateFor === "watts") { document.getElementById("voltsInput").placeholder = "Enter Volts"; document.getElementById("ampsInput").placeholder = "Enter Amps"; document.getElementById("voltsInput").value = ""; document.getElementById("ampsInput").value = ""; } else if (calculateFor === "volts") { document.getElementById("powerInput").placeholder = "Enter Watts"; document.getElementById("ampsInput").placeholder = "Enter Amps"; document.getElementById("powerInput").value = ""; document.getElementById("ampsInput").value = ""; } else if (calculateFor === "amps") { document.getElementById("powerInput").placeholder = "Enter Watts"; document.getElementById("voltsInput").placeholder = "Enter Volts"; document.getElementById("powerInput").value = ""; document.getElementById("voltsInput").value = ""; } } // Call on page load and when selection changes document.addEventListener("DOMContentLoaded", updateInputVisibility); document.getElementById("calculateFor").addEventListener("change", updateInputVisibility); // Initial call to set visibility on load updateInputVisibility();

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