1. What is the RF Power Equation?

The RF power equation \( P = V^2/R \) calculates the power dissipated in a load when the voltage across it and its resistance are known. This is fundamental in RF engineering for determining power levels in circuits.

2. How Does the Calculator Work?

The calculator uses the power equation:

Where:

• \( P \) — Power in watts (W)
• \( V \) — RMS voltage in volts (V)
• \( R \) — Resistance in ohms (Ω)

Explanation: The power is proportional to the square of the voltage and inversely proportional to the resistance.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for designing RF systems, ensuring proper power delivery, and preventing component damage from excessive power.

4. Using the Calculator

Tips: Enter voltage in volts (RMS value) and resistance in ohms. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Is this formula valid for AC signals?
A: Yes, when using RMS voltage values, this formula works for both DC and AC signals.

Q2: What's the difference between peak and RMS voltage?
A: For sinusoidal signals, RMS voltage is peak voltage divided by √2. Always use RMS voltage for power calculations.

Q3: Can I use this for impedance matching?
A: Yes, when the load is purely resistive (no reactance), this formula helps determine power transfer.

Q4: What if my load isn't 50 ohms?
A: The formula works for any resistance value. Just input the actual load resistance.

Q5: How does this relate to dBm?
A: To convert watts to dBm: dBm = 10*log10(P/0.001). 1 mW = 0 dBm.