If a lamp has a resistance of 25 ohms, what must the resistance of a second...
If a lamp has a resistance of 25 ohms, what must the resistance of a second lamp, which is connected in parallel to the first, be for the total resistance to be 18.75 ohms?
Homework Answers
Net effective resistance R of a parallel connection is given by R = R1xR2/ (R1 + R2)
R = 18.75 ohms , R1 = 25 ohms , R2 =?
18.75 = 25x R2 / (25 + R2)
18.75*25 + 18.75 R2 = 25 R2
468.75 = 6.25 R2
R2 = 468.75 / 6.25
R2 = 75 ohms
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