1. What is a Power to Voltage Calculator?

Definition: This calculator determines the voltage across a resistor when the power dissipation and resistance are known.

Purpose: It helps electrical engineers, technicians, and students quickly calculate voltage in power-resistance relationships.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( V \) — Voltage (Volts)
• \( P \) — Power (Watts)
• \( R \) — Resistance (Ohms)

Explanation: This formula is derived from the power equation \( P = \frac{V^2}{R} \), rearranged to solve for voltage.

3. Importance of Voltage Calculation

Details: Knowing the voltage is crucial for circuit design, component selection, and ensuring electrical safety in systems.

4. Using the Calculator

Tips: Enter the power in watts and resistance in ohms. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the relationship between power, voltage and resistance?
A: They're related by the formula \( P = \frac{V^2}{R} \), where power equals voltage squared divided by resistance.

Q2: Can I use this for AC circuits?
A: Yes, for purely resistive loads. For reactive loads, you'll need to consider power factor.

Q3: What if I know current instead of resistance?
A: Use Ohm's Law \( V = P/I \) where I is current in amperes.

Q4: Why does voltage increase with resistance at constant power?
A: Because \( V = \sqrt{P \times R} \), higher resistance requires higher voltage to maintain the same power.

Q5: What are typical applications of this calculation?
A: Designing power supplies, determining voltage drops, sizing resistors for power dissipation, and troubleshooting circuits.