Electronics > Beginners

New 2017 Macbook Pro 15 Inch giving me static electric shock. Is it normal?

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wraper:

--- Quote from: electrolust on August 30, 2017, 06:21:39 am ---You did cause me to google it, and the top result is https://www.physics.ohio-state.edu/~p616/safety/fatal_current.html which claims that 100-200mA is deadly due to v.fib, whereas above 200mA has very good survivability as the heart stops at higher currents.

--- End quote ---
Only if somebody makes a heart massage for you. Otherwise you have nearly zero chance survive with stopped heart and not breathing. Also I'm dubious about so narrow current range considered as fatal.

Gyro:

--- Quote from: wraper on August 30, 2017, 08:47:44 am --- :palm: |O I changed units for a reason that uA may look like very small current for some people (beginners).

--- End quote ---

@wraper: If you're going to get all shirty about it...

You should be sticking to standard SI / Engineering notation (even more so for beginners). We don't talk about 0.25M resistors, we say 250k. We don't use 0.25kV when we mean 250V etc.

250uA is the appropriate notation in this case.

Ian.M:
<PEDANT>
Actually, the applicable standard:
IEC 60950-1 "Information technology equipment – Safety"
quotes the touch current limits in mA.  even though some are under 1 mA.  |O

A copy of the English pages of  IEC 60950-1 2nd ed. 2005 can be found [here].

Page 357 (PDF page 181)

</PEDANT>

Gyro:

--- Quote from: Ian.M on August 30, 2017, 11:00:48 am ---<PEDANT>
Actually, the applicable standard:
IEC 60950-1 "Information technology equipment – Safety"
quotes the touch current limits in mA.  even though some are under 1 mA.  |O
....
</PEDANT>

--- End quote ---

<Fellow Pedant>

Yes, I guess they have an excuse in that case because they have >1mA values appearing in the same column. Doing otherwise would be more confusing.

</Fellow Pedant>  :)

wraper:
Current leakage value in uA units does not make sense as region of interest/danger lies in mA region. Also regarding:

--- Quote from: Gyro on August 30, 2017, 09:46:08 am ---You should be sticking to standard SI / Engineering notation (even more so for beginners). We don't talk about 0.25M resistors, we say 250k. We don't use 0.25kV when we mean 250V etc.

250uA is the appropriate notation in this case.

--- End quote ---
Why engineers are using 0.1uF capacitors for decoupling? And 0.1uF naming is mentioned more often used than 100nF. BTW it's even more common for markings on capacitors. I'm sure that you definitely should tell engineers and manufacturers that all of them are wrong. And for sure you should tell to those who made that 0.05 ohm resistor instead of 50 mohm, they they are complete idiots.


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