1. What is the Power Formula?

The power formula \( W = \frac{V^2}{R} \) calculates electrical power in watts for resistive loads like water heaters. It's derived from combining Ohm's Law and the power formula.

2. How Does the Calculator Work?

The calculator uses the power formula:

Where:

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

Explanation: This formula calculates the power consumption of a resistive electrical device when voltage and resistance are known.

3. Importance of Power Calculation

Details: Calculating power consumption is essential for determining energy usage, sizing electrical circuits, estimating operating costs, and ensuring electrical safety for water heating 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: Why is this formula important for water heaters?
A: Water heaters are resistive loads, and this formula helps determine their power consumption, which affects energy bills and circuit requirements.

Q2: What are typical voltage values for water heaters?
A: Residential water heaters typically operate at 120V or 240V, while commercial units may use higher voltages.

Q3: How does resistance affect power consumption?
A: Lower resistance results in higher power consumption for the same voltage, as power is inversely proportional to resistance.

Q4: Can this formula be used for other appliances?
A: Yes, this formula applies to any purely resistive electrical load, including incandescent lights and heating elements.

Q5: How accurate is this calculation for real-world applications?
A: The calculation provides theoretical power consumption. Actual consumption may vary slightly due to factors like temperature effects on resistance and efficiency losses.