Why is it necessary to insert the connecting wires to the proper slots/sockets?

3. In the figure below R₁ = 40.00R₂ = 30.00, and the ideal battery has emf-110V. What is the current at point a if we close (a) only switch S1, (b) only switches S1 and S2, and (c) all three switches? 18 R₁ www R₁ S3 RR₁ Im Im R₂ R₂

9 V W 3 Ω P iz İ3 12 V {652 6Ω in S The loop in the figure refers to the right section of the circuit. Please write both of the following: 1) Kirchhoff's loop equation starting at the negative terminal of the 12 V battery and passing through middle branch. 2) Kirchhoff's junction equation at point P.

thx