Question

rilation between R1, R2, R3

Answer 1

When R1, R2 and R3 are connected in series, then

R1 + R2 + R3 = R , where R is the total equivalent resistance.

When R1, R2 and R3 are connected in parallel, then

1/R = 1/R1 + 1/R2 + 1/R3, Where are is the total equivalent resistance.

Hope it'll help...:)

Answer 2

Hey mate here is your answer .


If r1 is in series with parallel connected to r2 and r3, the total current decreases if r2 opens.

Explanation:

Before opening of r2
Req1=r1+r2r3r2+r3
Req1=r1+r31+r3r2 (1)
After opening of r2:
hence r2=infinity (2)
write down (1) after substitution of (2)
Req2=r1+r3[sincer3r2=0 if r2=infinity]
Req2=r1+r3 (3)
from  (1)&(3)
Req2>Re


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