The watt calculator helps users calculate the amount of power or energy required for a specific task or appliance.
A watt (W) is a unit of power, and you can calculate the power (in watts) using the following equation:
The equation that our watt calculator uses is as follows:
W = A × V
Where,
The power equation we discussed earlier is derived from Ohm’s Law, which states that:
It is named after the German physicist Georg Simon Ohm, who first formulated it. The second formula that our watt calculator uses based on Ohm’s Law, expressed mathematically as:
V = I × R
Where,
Let’s say you have a circuit, like a small electronic device, with the following information:
Now, we want to find out how much power (P) this device consumes. We can use a simple formula:
P = A × V
Next, add the values into the equation and calculate:
So, this means the device uses 24 watts of power.
You can easily calculate the values of these four variables by using Ohm’s and Watt’s equations:
If you have the values for any of these two variables, you can adjust the above equations as per your needs.
Take a moment to review the chart below, which illustrates each of these transformations for better understanding.
Calculate | Formula | Description |
---|---|---|
Power (P) | \(P = V \times I\) | Direct measurement of voltage and current required. |
Power (P) | \(P = \frac{V^2}{R}\) | Voltage and resistance known. Useful for understanding power dependence on voltage and resistance. |
Power (P) | \(P = I^2 \times R\) | Current and resistance known. Useful for understanding power dependence on current and resistance. |
Voltage (V) | \(V = I \times R\) | Current and resistance known. This is Ohm's Law. |
Voltage (V) | \(V = \frac{P}{I}\) | Power and current known. Useful when power consumption and current are measured. |
Voltage (V) | \(V = \sqrt{P \times R}\) | Power and resistance known. Useful for calculating voltage when resistance limits power. |
Current (I) | \(I = \frac{V}{R}\) | Voltage and resistance known. This is Ohm's Law. |
Current (I) | \(I = \frac{P}{V}\) | Power and voltage known. Useful when power consumption and voltage are measured. |
Current (I) | \(I = \sqrt{\frac{P}{R}}\) | Power and resistance known. Useful for calculating current when resistance limits power. |
Resistance (R) | \(R = \frac{V}{I}\) | Voltage and current known. This is Ohm's Law. |
Resistance (R) | \(R = \frac{V^2}{P}\) | Voltage and power known. Useful for understanding resistance impact on power dissipation. |
Resistance (R) | \(R = \frac{P}{I^2}\) | Power and current known. Useful for understanding resistance impact on current flow. |
The power (watts) of 1 amp depends on how much electrical voltage is there. Let’s say the voltage is 120 volts, then 1 amp would be equivalent to 120 watts of power. The power depends on how strong the electricity is (voltage).
Keep in touch
Contact Us© Copyright 2025 by calculatored.com