Questions tagged [units]

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Convert counts CCD output to irradiance units

I'm performing some tests with a spectrometer (a model similar to this one but more recent) equipped with a CCD. I can only output to counts, not W/(m^2*nm) (ie: irradiance units) which is what ...
5
votes
2answers
11k views

PCB Layout: Reconciling metric and imperial measurement units

I am using Eagle CAD to lay out a BGA based PCB, for manufacture at Laen's prototyping service. One of the problems which I am having is that BGA parts are typically specified using metric units (for ...
4
votes
6answers
540 views

Why should any unit be used instead of the watt (W) as a power unit?

I am taking a course on AC circuits and so far I have seen that for the different types of power (read real, reactive and complex) different units are used. For the real power, which is power in fact ...
11
votes
1answer
4k views

Why is current (and not charge) an SI base unit?

Recently I've been wondering why the Ampere is an SI base unit and not the Coulomb (which is derived). I read this answer https://electronics.stackexchange.com/a/23456/16834 , but I'm not sure I'm ...
5
votes
2answers
90k views

Confusion between MW and MWh

A 1MW power plant producing power constantly for 24 hours will produce 24 MWh a day. Is that right? If it is, I don't understand when it says, in http://www.beaconpower.com/files/Flywheel_FR-Fact-...
20
votes
5answers
34k views

What does BSC SQ mean?

I'm reading this DAC datasheet. The last page (p. 32) gives certain of the chip's dimensions, some in units of "BSC SQ". What does BSC SQ mean? Is it standard to express sizes in BSC SQ?
4
votes
2answers
3k views

Units of noise spectral density

I'm reading the datasheet of a DAC (see page 6), and the "Output Noise Spectral Density" has units V / Hz^(1/2). The Wikipedia article on noise spectral density ...

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