Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [math-notation]

18 questions
31
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5 answers

What is a "100R" resistor?

Sometimes I see references to "R" resistors. For example: Obviously the 100 refers to 100 Ohms. What does 100R mean?
Tyler Durden
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3 answers

V/I uppercase/lowercase convention?

Is there any standard in industry for using uppercase or lowercase for V and I in circuit diagrams? I ask this because my book seems to switch back and forth between the two without any rhyme or reason and I can't figure out any pattern for why it…
Austin
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12
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3 answers

Do square wave exist?

If we send a square waveform through an antenna, will we get square electromagnetic waves with electric and magnetic fields looking like squares? Also, since there is an abrupt/almost jump in amplitude, will we get very high frequency sine waves…
Vishwa Mithra Tatta
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2
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1 answer

What does the double vertical bar mean here?

I'm reading on air "gap impedance" and came across this equation from these notes on the topic. http://web.mit.edu/6.685/www/chapter8.pdf (see page 7). The article defines this equation as: The “gap impedance”, or the impedance looking to the right…
Hunter Livesay
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2
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0 answers

Need help understanding notation in mathematical optimization equation?

I have been reading the research paper ["Distributed Joint Power, Association and Flight Control for Massive-MIMO self-Organizing Flying Drones"][1](Paper is from IEEE so it might be stuck behind a pay wall) and I got stuck on the notation they use…
Gabe Skidmore
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2 answers

Current Notation in BJT

We are currently studying BJTs in electronics I and I am a bit confused on the notation of the current, specifically the collector current here. Throughout this chapter they will swap \$I\$ and \$i\$ to seemingly refer to the exact same thing. The…
ModularMan
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1 answer

Opposite of reflection coefficient

The reflection coefficient (in circuits, for example) is generally given the symbol Gamma (\$\Gamma\$). What is the symbol given for the pass or transmission coefficient \$1-\Gamma\$? I've usually just seen it written out in terms of \$\Gamma\$ but…
nate
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1 answer

HSpice Manuals/Handbooks. What does Þ mean in the equations?

I'm working with the HSPICE MOSFET Models Manual for a university project. In some equations there's this \$Þ\$ symbol. For example from an equation regarding the Shichman-Hodges Model: $$ W_\text{eff}=M\cdot \left( W_\text{scaled} \cdot WMLT +…
Sky V
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1
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3 answers

What does \$x^*(t)=x(t)\$ mean in signals and systems?

I am often seeing this notation \$x^*(t)=x(t)\$ or similar but I cannot remember when I saw it the first time and I cannot find anywhere that explains the meaning of that notation. What does it mean?
J. Doe
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DC Analysis of Transistor Circuits - Double vertical line symbol

I have stumbled twice across this symbol || being used in the analysis of transistor circuits. An example can be seen at this address: http://www.learningaboutelectronics.com/Articles/Dc-analysis-of-a-bipolar-junction-transistor-circuit I can…
user3728501
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How to convert A/m to dBμA/m?

Lets say I have -2 dBμA/m as a limit. How do I convert the magnetic field strength in A/m to dBμA/m? Is it as follows? $$20\cdot \log(\frac{ |H| }{10^{-6}})$$ Thank you!
Defindun
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What notation is this? (Boolean/Logic Function)

I've come across these questions. What notation is being used in the 2nd and 3rd question? Thanks
Nabeel Farooqui
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2 answers

Mathematical therefore symbol (∴) needed for documenting circuit analysis calculations

When doing circuit analysis calculations I use the mathematical therefore symbol in my calculations and need to document my iterations to support my analysis. There is no ASCII code for the "therefore" symbol. There is a UNICODE U+2211 for it that…
SamR
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Notation for switches in ladder notation

I was reading https://www.allaboutcircuits.com/textbook/digital/chpt-10/monostable-multivibrators/, and at the bottom of the page it has I read their page on switch notation, but it did not say what the arrows, like the weird one for TD1 means. So…
ions me
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1 answer

Complex reactance formula explanation

Can someone explain the math behind the following relationships between the equalities in a capacitor's reactance? $$X_C = \frac{1}{2\pi f C} = \frac{-j}{\omega C} = \frac{1}{j \omega C}$$ For instance the second member, $$\frac{1}{2\pi f C}$$ It…
E. l4d3
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