For a purely resistive matched load, RMS voltage equals the square root of power in watts times resistance in ohms. State RMS and waveform assumptions.
How it works in practice
For a sinusoid, peak voltage is RMS voltage multiplied by the square root of two, and peak-to-peak is twice peak. Standing waves and modulation can increase maximum voltage. These calculations do not establish a component's insulation rating.
Example and interpretation
1 W in 50 ohms gives about 7.07 V RMS, 10 V peak and 20 V peak-to-peak for a sine wave.
Checks before use
- Define load impedance
- Calculate RMS voltage
- Convert waveform peaks
- Check actual voltage limits
Important limit
Do not use sine-wave peak conversion for an arbitrary waveform without checking its crest factor.
Related Centron RF product
SMA 2 W 6 GHz fixed attenuator. Use calculated levels to define a requirement, then compare it with the exact product’s current bandwidth, input power, impedance and available attenuation options. Calculations assume stated conditions and do not replace a component datasheet.
Further reading
Keysight: Fundamentals of RF and Microwave Power Measurements. This background reference explains general principles; the selected Centron RF model’s datasheet governs its own ratings.
Related guides
Educational guide. Numerical examples use the stated assumptions and are not test results for a supplied unit.