1. What is Electrical Power?

Electrical power is the rate at which electrical energy is transferred by an electric circuit. It is measured in watts (W) and represents how much work can be done by the electrical system per unit time.

2. How Does the Calculator Work?

The calculator uses the fundamental power formulas:

Where:

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

Explanation: You can calculate power using any two of the three parameters (voltage, current, resistance). The calculator will determine the missing values automatically.

3. Ohm's Law and Power Formulas

Details: These formulas are derived from Ohm's Law (V = I × R) and the definition of electrical power (P = V × I). They are fundamental to understanding and designing electrical circuits.

4. Using the Calculator

Tips: Enter any two known values (voltage, current, or resistance). The calculator will compute the power and any missing parameters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between AC and DC power calculations?
A: This calculator uses formulas for DC circuits. For AC circuits, power factor must be considered for accurate calculations.

Q2: Can I calculate power if I only know one value?
A: No, you need at least two of the three parameters (V, I, or R) to calculate power using these formulas.

Q3: What are typical power values in household circuits?
A: Household appliances typically range from a few watts (LED bulbs) to thousands of watts (heaters, air conditioners).

Q4: How does resistance affect power dissipation?
A: For a fixed voltage, higher resistance means less current and less power. For a fixed current, higher resistance means more voltage drop and more power.

Q5: Are these formulas applicable to all electrical components?
A: These formulas work for resistive loads. For reactive loads (capacitors, inductors), additional considerations are needed for AC circuits.