1. What is the Power Equation?

The fundamental power equation in electrical systems relates power (P), voltage (V), and current (I). These relationships are essential for designing and analyzing electrical circuits.

2. How Does the Calculator Work?

The calculator uses these equations:

Where:

• \( P \) — Power in watts (W)
• \( V \) — Voltage in volts (V)
• \( I \) — Current in amperes (A)

Explanation: Enter any two known values to calculate the third unknown value. The calculator automatically determines which equation to use based on the inputs provided.

3. Practical Applications

Details: These calculations are essential for circuit design, electrical safety assessments, power supply sizing, and energy consumption calculations in both AC and DC systems.

4. Using the Calculator

Tips: Enter any two known values (voltage, current, or power) and leave the third field empty. The calculator will compute the missing value. All inputs must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Can this be used for both AC and DC circuits?
A: Yes, for DC circuits and AC circuits with purely resistive loads. For reactive AC loads, power factor must be considered.

Q2: How accurate are these calculations?
A: The calculations are mathematically precise. Real-world accuracy depends on the precision of your input measurements.

Q3: What's the difference between real power and apparent power?
A: This calculator computes real power (watts). Apparent power (VA) includes reactive power in AC systems with inductive or capacitive loads.

Q4: Can I calculate current for a given power and voltage?
A: Yes, enter the power and voltage values, leaving current empty to calculate amperage.

Q5: How do I determine wire size from these calculations?
A: Current (amps) is the critical factor for wire sizing. Consult ampacity tables after calculating current.