Ben elektrik akımını ölçüyorum.

In Turkish the verb ending already tells you who the subject is, so pronouns like ben, sen, o are usually dropped. You only include Ben if you want extra emphasis (“I, specifically, am measuring…”). Otherwise it’s perfectly natural to say:
Elektrik akımını ölçüyorum.

1. Elektrik = “electricity” (first noun, bare)
2. akım = “flow, current” (second noun)
3. To say “electric current” in Turkish, many technical compounds leave the first noun unmarked and add a 3rd-person singular possessive -ı to the second:
   akım → akımı (“its current,” i.e. the current of electricity)
4. Because the whole phrase is the definite direct object here, you then add the accusative -ı again. Since akımı ends in a vowel, a buffer n is inserted before the accusative vowel:
   akım + -ı (possessive) + -nı (definite accusative) → akımını

Breakdown of akımını:

• akım = “current”
• -ı = 3rd-person singular possessive (forms the compound “electric current”)
• -nı = accusative (marks “the electric current” as a definite object)
  The n is a buffer consonant needed when adding a vowel-initial suffix onto a vowel-final stem.

• ölçüyorum = “I am measuring” (happening right now)
• ölçerim = “I measure / I would measure” (simple present, used for habits, general truths, or sometimes conditional)
  English often uses one “present,” but Turkish distinguishes ongoing actions (with -yor) from habitual/general actions (with -r).

1. Root: ölç- (“to measure”)
2. Present-continuous suffix: -(i)yor (this i changes by vowel harmony)
   
   • Because ölç has ö, the suffix becomes -üyor
3. 1st-person singular ending: -um
   
   • Harmonizes with ü → -üm
4. Combine: ölç + üyor + üm → ölçüyorum

Turkish is generally Subject-Object-Verb (S-O-V).
In Ben elektrik akımını ölçüyorum:

• Ben = Subject
• elektrik akımını = Object
• ölçüyorum = Verb
  If you drop Ben, you still get S-O-V:
  Elektrik akımını ölçüyorum.