Voltage Calculation: What Are the Necessary Values?

[nothing909]

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.

 

[berkeman]

Did you use 50 Ohms for R?

 

[nothing909]

no, that's the only information i was given to answer the question.

 

[berkeman]

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".

 

[berkeman]

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?

 

[nothing909]

ty, never knew that

 

[berkeman]