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Windows 7: Ohm's Law

24 Sep 2013   #1

Windows 8 64bit Professional
 
 
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 SpecsSystem Spec
24 Sep 2013   #2
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

My System SpecsSystem Spec
24 Sep 2013   #3

Windows 7 Home Premium 64-bit
 
 

I feel like I'm helping you cheat on a test. Divide 60 by 12 = 5.
My System SpecsSystem Spec
24 Sep 2013   #4

Windows 8 64bit Professional
 
 

Quote   Quote: Originally Posted by johnsmith45jock View Post
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 SpecsSystem Spec
24 Sep 2013   #5

Microsoft Community Contributor Award Recipient

Windows 7 Pro 64 SP1
 
 

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 SpecsSystem Spec
24 Sep 2013   #6

Windows 8 64bit Professional
 
 

Quote   Quote: Originally Posted by derekimo View Post
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 SpecsSystem Spec
24 Sep 2013   #7

Microsoft Community Contributor Award Recipient

Windows 7 Pro 64 SP1
 
 

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 SpecsSystem Spec
24 Sep 2013   #8

Windows 8 64bit Professional
 
 

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 SpecsSystem Spec
24 Sep 2013   #9

Microsoft Community Contributor Award Recipient

Windows 7 Pro 64 SP1
 
 

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 SpecsSystem Spec
24 Sep 2013   #10
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

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 SpecsSystem Spec
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