Resistor Wattage(Power Rating) Calculator

In this Resistor Power Calculator, you can calculate the Power Rating or Wattage of a Resistor. You can calculate how much power-rated resistor will be suitable for your circuit.

Resistor Wattage(Power Rating Calculator)

Enter Your Values. The calculator will automatically generate the result.

How to Use This Calculator?

To use the calculator, follow these steps:

You must provide a minimum of any two inputs to get the result.
If you want to measure the resistor wattage value you can enter any two from voltage, current, and resistance value.
Enter the resistance value if you want to calculate the power rating.
Choose the appropriate unit for resistance (Ohm, Kiloohm, or Milliohm) from the dropdown menu.
Enter the voltage value that will be applied across the resistor.
Select the unit for voltage (Volt, Kilovolt, or Millivolt).
Enter the required current flow through the resistor.
Choose the unit for current (Ampere, Kiloampere, or Milliampere).
Enter the power rating value if you want to calculate the resistance.
Select the unit for power rating (Watt, Kilowatt, or Milliwatt).
Once you have entered the appropriate values the calculator will automatically show the appropriate results in the result section below.
If needed, you can repeat the process by changing the input values and submitting the form again to calculate different results.

Resistor Wattage(Power Rating Calculator)

Formula

Here are the formulas, this calculator uses for the calculation.

Power (P) rating of the Resistor = Voltage (V) Across the Resistor * Current (I) through the Resistor

Voltage (V) Across the Resistor = Power (P) rating of the Resistor / Current (I) through the Resistor

Current (I) through the Resistor = Power (P) rating of the Resistor / Voltage (V) Across the Resistor

Resistance (R) Value of the Resistor = Voltage (V) Across the Resistor / Current (I) through the Resistor

Power (P) rating of the Resistor = Current (I) through the Resistor² * Resistance (R) Value of the Resistor

Voltage (V) Across the Resistor = Current (I) through the Resistor) * Resistance (R) Value of the Resistor

Current (I) through the Resistor = Voltage (V) Across the Resistor / Resistance (R) Value of the Resistor

Resistance (R) Value of the Resistor = Voltage (V) Across the Resistor² / Power (P) rating of the Resistor

Why Power Rating of a Resistor is Important?

The power rating of a resistor is very important because it tells you how much power the resistor can handle without getting damaged. When a resistor is used in a circuit, it turns some of the electrical energy into heat. If the power going through the resistor is too high, it can overheat and stop working properly. Even it may be burned.

By giving attention to the power rating, you can choose a resistor that can handle the power in your circuit without overheating. If a resistor overheats, it can stop working or even cause other parts of the circuit to fail. So, it's important to pick a resistor with a power rating that matches the needs of your circuit to make sure it works reliably and safely.

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Resistor Wattage(Power Rating) Calculator