What is the equivalent resistance of a parallel circuit with a 5.0 kΩ resistor, a 2.5 kΩ resistor, and 10.0 kΩ resistor?

Question

A. 0.10 kΩ

b. 0.83 kΩ

c. 10 kΩ

d. 1.4 kΩ

e. 18 kΩ

Answer 1

R_eq
=1/(1/R1+1/R2+1/R3+...)

So, with 3 resistors,
R_eq
=1/(1/5+1/2.5+1/10)
=...

Answer 2

1/R = 1/5 + 2/5 + 1/10 = (2+4+1)/10 = 7/10
so R = (10/7) k Ohms =1.44 k Ohms

Answer 3

thx, MathMate and Damon :)