Question

A circuit contains two resistors connected in parallel. The value of R1 is 2,000 and the value of R2 is
4,200 . What is the total resistance in this circuit?
A. 2,709
B. 6,200
C. 1,355
D. 987

Answer 1

For any two resistors in Parallel you can use the formula for total resistance as;

R total   =  Product / Sum

Rt    =  (R₁R₂) / (R₁+ R₂)          R₁ = 2000,  R₂ = 4200

Rt =  (2000*4200) / (2000 + 4200)   Use calculator.

     =  1354.8

Total resistance = 1355    C.