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March 5, 2015

Homework Help: Physics-Please help

Posted by Lynn on Saturday, February 5, 2011 at 11:05am.

R1= 10 ohm
R2= 20 ohm
R3= 50 ohm
R4= ???

R1, R2, R3 and R4 are connected in parallel across a 120 V "power" supply to generate a current of 21 Amps. The value of R4 is most nearly _____ ohms.

0, 5, 10, 16, 100, 200, 300

I think 5 ohms, but I'm not sure...In need of some assistance, please

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