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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