Finally ..

[lihan161051.livejournal.com]

.. got to use Ohm's Law on a call. :D

Of course, it was someone who found the power supply wattage rating and was throwing a fit because the specs didn't mention current. I was *so* tempted to tell him to solve Ohm's Law for I and remember V=120V, give or take a bit. (I was also tempted to tell him about this nifty optical illusion you can get with the keyboard .. LOL)

But I didn't. I'm not that mean. :D

Comments

[shadedspriter.livejournal.com]

can you explain both of them things you mentioned (It has been 6 years since my GCSE Electronics class...and I think I heard about the keyboard optical illusion...but please explain.)

[redhillian.livejournal.com]

http://en.wikipedia.org/wiki/Ohm%27s_Law

Someone else can do the keyboard optical illusion.

[ghostdandp.livejournal.com]

Simple:
P
------
I | E

What? That doesn't explain it?

[shadedspriter.livejournal.com]

Thanks both of you...the whole triangle is coming back to me now.

[hopefulnebula]

XKCD reference for the win. :D

[shadedspriter.livejournal.com]

Okay I get the Optical illusion joke now...

keyboards are disgusting.

[kayfox.livejournal.com]

The wattage rating (which is the output rating, not the input) is always less than what the power supply can draw at full output. But, since most computer power supplies are switching, they only draw what they need.

Now, whats really fun is using HP server power supplies to power radios, they gladly supply 12V at 23 Amps and cost about a buck apiece at the surplus place.

[mchicago.livejournal.com]

P = VI for a radio would give an input wattage of 276 Watts. Given an efficincy rating on the radio gear of lets say 60% gives out only 165.6. A full license would allow me to transmit at 400w, and a special experiemtn license 1kw, which means I would need a powersupply rated for 667 Watts.

Unfortunatly they dont cost about $1 each :(.

Did I do my maths right there?