# Can you solve this resistor physics question?

What resistance must be placed in parallel with a 184- resistor to make the equivalent resistance 119?

### 6 Answers

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- oubaasLv 72 months ago
119 = 184*R / (184+R)

21896 = R(184-119)

R = 21896 / (184-119) = 336.9 ohm

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- SkyLv 72 months ago
One way to write the parallel resistance formula is (R1 x R2)/(R1+R2)

So, for the mystery resistance R, write it as (184 x R)/(184+R)=119

Solve for R. If you understand algebra, this is easy.

The usual parallel resistance formula is:

1

------------------------------

(1/R1)+(1/R2)+(1/R3)...

So, if you write

1

------------------ = 119 and solve for R, you'll get the same answer.

(1/184)+(1/R)

Source(s): I once tutored algebra- Log in to reply to the answers

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- Anonymous2 months ago
Yes I can

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Note that a 5% tolerance in the 337 ohm resistor gives 2% variation in the combination. ie 117<R<121 ohm.. If you were to choose from standard values a 330 ohm 5% resistor is the closest that you could obtain from the common 5% range.