Please help me with energy homework.?

I am struggling with these questions

?2019-10-17T00:27:35Z

23. Superconductors
24. resistance, high
25.
26. a. 12= 24i; i= 1/2 amp
b. P= (1/2)12= 6 W
27. a. 4*1.5= 6 V
b. 1.5 V