Contemporary Electronics Fundamentals, Devices, Circuits, and Systems 1st Edition by Louis Frenzel

تمرين 4

Three currents I 1 , I 2 , and I 3 flow into point X, whereas current I 4 flows away from point X. If I 1 = 2.5 A, I 3 = 6 A, and I 4 = 18 A, how much is current I 2
A) 21.5 A.
B) 14.5 A.
C) 26.5 A.
D) 9.5 A.