Question

the parallel combination of three resistance takes curnt of 7.5A from 30V supply.if the two resistors are of 10ohm and 12ohm.fimd third one?​

Answer 1

Answer:

-> Third resistor is of 15 ohm.

Explanation :

-> In the attachment given

Answer 2

Answer:15Ohm

Explanation:Given that

i=7.5A and v=30v

Then ,from ohms law ,

V=iR

30=7.5×R

R=300/75

R=4ohms

Now,Req=4ohm

1/R=1/R1+1/R2+1/R3

1/4=1/12+1/10+1/R3

8R3=120

R3=120/8

R3=15

Hence R3=15 ohm