# Questions tagged [units]

A specified amount of a quantity (e.g. voltage, current, power, time, etc.) by comparison with which any other quantity of the same kind is measured or estimated. The standard system of units is the International System of Units (SI).

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### Inductance Computed As Length in Historical Document

In "Formulas and Tables for the Calculation of Mutual and Self-inductance.", many equations compute the inductance of an arrangement as a length. For example, Equation 95, on p. 150, states,...
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### 18650 cell will use ______ amps every _____mins?

I am looking at how to utilise the BQ77915 Ultra-Low Power Primary Protector with Autonomous Cell Balancing by TI, using eight 18650 cells, each with a BQ77915 IC allowing 3 series - 5 series cells. ...
1 vote
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### Time Domain Normalization of the IMP23ABSU Microphone

I have tried to evaluate the analog microphone (IMP23ABSU) built into the STEVAL-STWINKT1B with the FP-SNS-DATALOG1 (HS-Datalogger). The values were exported as "raw values" (this is an ...
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### What does the "proportional symbol" (∝) mean when used as a time unit prefix?

In several datasheets for electronic components, I have seen a ∝ symbol used as a prefix for a time unit, usually seconds, writing as ∝s. As far as I know ∝ is not a valid SI prefix, so what does it ...
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### What are these designations on a sensor datasheet?

I'm working with image sensor Anafocus Lince5M. In its datasheet there are some designations that I can't understand (underlined). What are these designations? And how to calculate threshold ...
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### $pV/\sqrt {Hz}$ in Power Spectral Density

I am trying to plot a Noise Spectral Density from 10 kHz to 1 MHz. The Graph shows a cure which at 1 MHz the noise is 76 pV/rootHz. I am unable to understand that unit definition here. Becuase the ...
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### Units of BJT parameters

Let's say the model is the Ebers-Moll model, but this obviously extends to other models:  I_{\mathrm{b}} = \frac{I_{\mathrm{s}}}{\beta_{\mathrm{f}}}\left(\mathrm{e}^{\frac{V_{\mathrm{be}}}{NV_{\...
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1 vote
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### SENT protocol output unit is LSB. What does this mean?

I have read couple of datasheet of devices which uses SENT protocol. They define the output between 193 and 3896. The unit is LSB. I think that this does not mean least significant bit? Example: ...
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### How much maximum electricity bill (units) can be generated on 2 KW connection?

I have got a bill of approx 14000 Units (50000 INR) for a month on 2kW connection. As per my analysis and understanding, it can't be more than 2 * 24 HRs * 30 Days = 1440. I think electricity meter ...
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### What other units can influence the way a wire glows than watt? [closed]

I have a vape device with a mod that lets me configure the power I want to operate it with and also as an additional setting that is called vape strength which can be set to soft/medium/hard. When ...
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### Pulse width modulation and textual expression of resulting stimulus level

So we have been using pulse width modulation (PWM) as a means to digitally change the driving voltage of vibration motors. Usually, afaik, the resulting voltage from PWM is expressed as %duty cycle ...
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### Why do so many PCB-designers use non-metric units? [closed]

TLDR: Why do so many PCB-designers use non-metric units? Sorry for asking this closed question again: what is the advantage of non-metric units But I do not understand, and there is also no other ...
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### What's the difference between measurement resolution and digits per second in time measuring devices

In time/frequency counters/analyzers in technical specifications you can almost always find resolution and digits per second values next to each other. What is the difference?
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### What is the unit of measure for a region's power supply?

So, I'm casually perusing an old issue of Foreign Affairs magazine and encounter a paragraph concerning the ability of Brazil's electrical power generating plants to supply juice. Said paragraph ...
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### Energy Consumption of AC Motors with same capacity and same hp

I have 2 3-phase motors with same capacity of 45kW, hp 60,rated Voltage is 415V, VFD 55kW connected separately to a Vessel Line that is used to mixing of few components.i.e, it looks like this. (I ...
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### Altium Symbol Wizard only in imperial

We have now got Altium 17 installed and set up, and I've used it to make various schematics. One feature of the software is the Symbol Wizard for creating our own symbols for different components. It'...
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