1. What is the Power Equation?

The power equation P = V²/R calculates electrical power in watts from voltage and resistance. It's derived from Ohm's law and represents the rate at which electrical energy is converted to other forms of energy.

2. How Does the Calculator Work?

The calculator uses the power equation:

Where:

• \( P \) — Power (watts)
• \( V \) — Voltage (volts)
• \( R \) — Resistance (ohms)

Explanation: The equation shows that power is proportional to the square of the voltage and inversely proportional to the resistance in an electrical circuit.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for circuit design, electrical safety assessments, energy consumption calculations, and proper component selection in electrical systems.

4. Using the Calculator

Tips: Enter voltage in volts and resistance in ohms. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What are the units for each variable?
A: Power is measured in watts (W), voltage in volts (V), and resistance in ohms (Ω).

Q2: Can this formula be used for AC circuits?
A: This formula applies to DC circuits. For AC circuits, additional factors like power factor must be considered.

Q3: What is a typical power range for household appliances?
A: Household appliances typically range from a few watts (LED bulbs) to several thousand watts (electric heaters, ovens).

Q4: How does resistance affect power consumption?
A: Higher resistance results in lower power consumption for a given voltage, as power is inversely proportional to resistance.

Q5: What safety considerations are important when working with electrical power?
A: Always ensure proper insulation, use appropriately rated components, and follow electrical safety protocols to prevent overheating and electrical hazards.