Power Calculator
Power Calculator
The Power Calculator is a simple and efficient tool designed to calculate electrical power, voltage, current, and resistance. Whether you are a student, technician, or engineer, this calculator allows you to apply Ohm’s Law and find missing values quickly and accurately.
What Is Electrical Power?
Electrical power (P) represents the rate at which energy is used or generated in an electrical circuit. It is measured in watts (W) and is one of the fundamental quantities in electricity. The general formula for power is:
P = V × I
Where:
• P = Power in watts
• V = Voltage in volts
• I = Current in amperes
How to Use the Power Calculator
To use our Power Calculator, simply enter any two known values — such as voltage and current — and the calculator will automatically compute the missing parameters. For example, if you know voltage and resistance, it can use Ohm’s Law to calculate current and then determine power.
This tool is ideal for electronics projects, lab experiments, and professional circuit design.
Ohm’s Law Formulas for Power
- P = V × I (Power from voltage and current)
- P = I² × R (Power from current and resistance)
- P = V² / R (Power from voltage and resistance)
These equations demonstrate how voltage, current, and resistance interact in any circuit. You can use them interchangeably depending on which quantities you know.
Example of Power Calculation
If a 12V battery supplies current of 2A to a device, the power consumed is:
P = 12 × 2 = 24W.
This means the device uses 24 watts of electrical power.
Why Use an Online Power Calculator?
Manual calculations can be time-consuming, especially for complex circuits. An online Power Calculator automates the process, reduces errors, and provides instant results. It’s a must-have for engineers, electricians, and students learning the basics of electrical energy.
Learn More About Electrical Power
For more detailed theory, visit these external references:
Wikipedia – Electric Power
All About Circuits – Power Calculator
Related Calculators
Explore other related tools on our site:
Ohms Law Calculator
Voltage Drop Calculator
FAQ – Power Calculator
1. What units does this calculator use?
Power is calculated in watts (W), voltage in volts (V), current in amperes (A), and resistance in ohms (Ω).
2. Can I calculate power if I only know voltage and resistance?
Yes, use the formula P = V² / R to determine power without current.
3. What is the difference between real power and apparent power?
Real power is measured in watts (W) and represents actual energy consumption. Apparent power, measured in volt-amperes (VA), includes both real and reactive components in AC systems.
4. Is this calculator suitable for AC and DC circuits?
Yes. For DC circuits, the calculations are direct. For AC, make sure to use RMS values of voltage and current for accurate results.
Conclusion
The Power Calculator simplifies electrical calculations and helps you understand how voltage, current, and resistance work together to produce energy. Whether for classroom learning, electrical design, or quick circuit testing, this tool is accurate, user-friendly, and essential for every electrical enthusiast.