# I keep getting wrong answer for sim[;e physics

• Jan 21st 2007, 07:14 AM
Greg
I keep getting wrong answer for sim[;e physics
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If power is 10 to the 6 and resistance is 100 ohms, what is my current
• Jan 21st 2007, 08:15 AM
CaptainBlack
Quote:

Originally Posted by Greg
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If power is 10 to the 6 and resistance is 100 ohms, what is my current

How does the attachment relate to this question? What is "a"?

RonL
• Jan 21st 2007, 12:08 PM
Greg
Sorry I got my questions mixed up. Itwas only the physics one I had trouble with
• Jan 21st 2007, 12:55 PM
CaptainBlack
Quote:

Originally Posted by Greg
Sorry I got my questions mixed up. Itwas only the physics one I had trouble with

P=vi
v=iR,

so:

P=Ri^2,

or:

i=sqrt(P/R)=sqrt(10^6/10^2)=100 amps

RonL
• Jan 22nd 2007, 02:14 PM
topsquark
Quote:

Originally Posted by Greg
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If power is 10 to the 6 and resistance is 100 ohms, what is my current

Though CaptainBlack is doubtless correct in his solution I would like to point out to Greg that you need to use units!
\$\displaystyle P = 10^6\$ W? kW? mW? Some other unit? We just don't know!

Oh, and since I'm ranting ( :) ) the unit for resistance is "Ohms" with a capital "O" because it is named for a person.

-Dan