Voltage Calculation: What Are the Necessary Values?

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To calculate the voltage of 890mV, the equation V = sqrt(VR) is used, where R typically represents the impedance. In this context, a standard impedance of 50 Ohms is commonly assumed for dBm measurements. The discussion clarifies that the values needed for the calculation were not provided, but the standard practice is to use 50 Ohms. This information helps in understanding how to derive the voltage from the given equation. Overall, the clarification on impedance is crucial for accurate voltage calculations in this scenario.
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Question:

The question and the solution are attached below. It asks to calculate the voltage and in the answers and the bottom, it says the voltage is 890mV. What are the values used to calculate this number?

It tells me the equation V = sqrt (VR) but I don't know the values to to put into calculate 890mV.

 

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Did you use 50 Ohms for R?
 
no, that's the only information i was given to answer the question.
 
Well, it's standard to use 50 Ohms as the impedance for dBm measurements. Usually it is called "dB above a milliwatt into 50 Ohms".
 
Last edited:
nothing909 said:
It tells me the equation V = sqrt (VR) but I don't know the values to to put into calculate 890mV.
So do you have what you need now? :smile:
 
ty, never knew that
 
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