Asked by Lana

What is the resistance of a coffee maker that draws a current of 5.0A from 117V source?
What resistance would have to be added in parallel with the same coffee maker to increase the current to 15.0A?

Okay, so for the first part I got 23.4 Ohms since R=V/I, but I don't really understand the second question. Like, I understand what I'm suppossed to do, but I don't know how. I woul really appreciate some help with this. Thanks in davance. :)
Answered by bobpursley
Right on the first part.

Ok, you want a total resistance of 15ohm, you have one 23.4ohm.

1/15=1/R+1/23.4

solve for R
Answered by Lana
oh! So, the resistance has to equal the total current, right?
because, I think that's what was messing me up. I figured I'd need to use the formual you used, but I just wasn't sure how. Oh, this is really easy now that I get it, thank you so much for clearing this up! :D
Answered by bobpursley
oops. totally disregard my response. I read it quickly and thought the 15 was total resistance.

Total resistance will be 117/15 ohms

so

15/117=1/23.4 + 1/r

solve for r.

sorry, I am working in too much of a hurry.
Answered by bobpursley
PS. Thanks for catching it.
Answered by Lana
oh, haha, okay, I see. Well, thank you for correcting your answer. :)
Answered by qokxdv wduia
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