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# Windows 7: Ohm's Law

 24 Sep 2013 #1 DreadStarX Windows 8 64bit Professional 314 posts Washington State Ohm's Law So, I'm sitting here in my Cisco Class, struggling to understand these questions, and what not. This is, by far, the most trouble I have ever had, relating to computers. Here is one of the questions. 5. The yellow wire connected to a power supply carries 12V. If the power supply provides 60W of power to the yellow wire, how much current is passing through the yellow wire? I came up with 5 Amperes aka 5 Amps. But I'm not entirely sure. Anyone got some nifty tricks to help me learn this? My System Specs
 24 Sep 2013 #2 Britton30 Windows 7 Ultimate X64 SP1 24,480 posts Mt. Crumpit/Whoville My System Specs
 24 Sep 2013 #3 johnsmith45jock Windows 7 Home Premium 64-bit 1,948 posts I feel like I'm helping you cheat on a test. Divide 60 by 12 = 5. My System Specs
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 24 Sep 2013 #4 DreadStarX Windows 8 64bit Professional 314 posts Washington State Quote: Originally Posted by johnsmith45jock I feel like I'm helping you cheat on a test. Divide 60 by 12 = 5. Nope. I was given similar materials as to what was posted above, except it confused the hell out of me. So it's I = P / V which translates to Current equals (=) Power / Voltage / I = 60W / 12V. I = 5 Amps I came up with the answer, but again I was confused. This should tell you why. Attached Images My System Specs
 24 Sep 2013 #5 derekimo Win 8.1 Pro x64 16,546 posts East Bay Area, CA Your answer is right, what part confuses you? Here's a calculator to check your math. Ohm's Law Calculator 60W/12V = 5A My System Specs
 24 Sep 2013 #6 DreadStarX Windows 8 64bit Professional 314 posts Washington State Quote: Originally Posted by derekimo Your answer is right, what part confuses you? Here's a calculator to check your math. Ohm's Law Calculator 60W/12V = 5A Well.. Having so many options opposed to having just 3. Like this question I have here. 3. Re-arrange the Ohm's Law equation to solve the following: R = And thats it. But now that I've looked at it; its literally the same equation for what you previously answered, only backwards. R = W / V. Least I think its that. My System Specs
 24 Sep 2013 #7 derekimo Win 8.1 Pro x64 16,546 posts East Bay Area, CA Quote: R = W / V. Least I think its that. Not quite, it's any of these 3 below depending on what you already know. If you want to use Watts and Volts it is R = VČ/ W Attached Images My System Specs
 24 Sep 2013 #8 DreadStarX Windows 8 64bit Professional 314 posts Washington State Well... If Ohm's Law is V = I*R then, wouldn't R = V / I be it then? Because V = I*R is the original equation. As you can see, my mathematical intelligence is fairly low when it comes to things of this caliber. But I still try My System Specs
 24 Sep 2013 #9 derekimo Win 8.1 Pro x64 16,546 posts East Bay Area, CA Quote: Well... If Ohm's Law is V = I*R then, wouldn't R = V / I be it then? Because V = I*R is the original equation. Yes it would. I just gave you the correct way with the previous terms you used, which was with Watts and Volts. My System Specs
 24 Sep 2013 #10 Britton30 Windows 7 Ultimate X64 SP1 24,480 posts Mt. Crumpit/Whoville Ohm's law would be easier if it used W=watts V=volts A=amps O=resistance The "I" and "P" and always confuse me. My System Specs