What do the I's stand for in attenuation and power loss equations?

Thread starter calculator20
Start date Mar 25, 2014
Tags

Attenuation Loss Power Power loss

AI Thread Summary

In the context of attenuation and power loss equations, "I1" typically represents the input power, while "I2" denotes the output power. The formula attenuation = 10 log (I1/I2) is used to calculate the loss in signal strength as it travels through a medium. Confusion arises because some examples may present the terms differently, but the standard convention is to consider I1 as the initial power and I2 as the final power. Understanding this distinction is crucial for accurate calculations in telecommunications and signal processing. Clarifying these definitions ensures proper application of the logarithmic equations in practical scenarios.

Mar 25, 2014

calculator20

I'm revising attenuation and power loss logarithmic equations.

The exam formula I'm given is attenuation = 10 log (I1/I2)

I'm trying to confirm what each I stands for.

Some of the examples I'm looking at seen to give input/output power, some seem to reverse it. Which is right? What do they stand for?

Physics news on Phys.org

Mar 25, 2014

BvU

Science Advisor

Homework Helper

http://en.wikipedia.org/wiki/Decibel

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .

View full post »

Thread 'Voltmeter readings for this circuit with switches'

TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...

View full post »

Thread 'Trying to understand the logic behind adding vectors with an angle between them'

My initial calculation was to subtract V1 from V2 to show that from the perspective of the second aircraft the first one is -300km/h. So i checked with ChatGPT and it said I cant just subtract them because I have an angle between them. So I dont understand the reasoning of it. Like why should a velocity be dependent on an angle? I was thinking about how it would look like if the planes where parallel to each other, and then how it look like if one is turning away and I dont see it. Since...

View full post »