Find the effective resistance of the circuits shown below.
Assume that R
1
=R
2
= 1 kOhm.
R
eff
= 1 kOhm + 1 kOhm
(R
eff
)
-1
= (1 kOhm)
-1
+ (1 kOhm)
-1
R
eff
= 2 kOhm
R
eff
= 500 Ohms