-Given the circuit in Figure , if R3 is changed to 100 Ω, the total circuit current will:
A) increase
B) remain the same
C) decrease
D) double

Question

-Given the circuit in Figure , if R3 is changed to 100 Ω, the total circuit current will:
A) increase 
B) remain the same 
C) decrease 
D) double

Quizplus · Accepted Answer

Changing R3 to 100 Ω decreases the overall resistance in the circuit if R3 was originally part of a series or parallel configuration. In a series circuit, the total resistance directly affects the total current (I=V/R), so decreasing resistance increases the current. In a parallel configuration, decreasing the resistance of one branch increases the total current through the circuit due to a higher branch current in the modified branch, thus increasing the overall circuit current.

-Given the Circuit in Figure , If R3 Is Changed