Download Aptitude Crack
img not found img not found

Series-Parallel Circuits - Engineering

Q1:

The parallel combination of a 470  resistor and a 680  resistor is in series with the parallel combination of four 2 k resistors. The total resistance is

A 1,650 

B 1,078 

C 77.8 

D 778 

ANS:D - 778 

@Riya,

Solving first parallel combination becomes 277.91.

Because R1 multiply by R2 divide by R1+R2.
470 * 680/470 + 680 = 319600/1150 = 277.913.