Question 13041 of 731 · Texas Journeyman Electrician Exam
On a single-phase circuit, the length of the run is doubled and the load current is cut in half, with the same conductor. What happens to the voltage drop?
Exactly one answer is correct.
You got of questions right. Here on the question pages nobody remembers which ones you got wrong. The trainer saves your progress and asks the mistakes again until they stick.
Or free: the 10 questions most people get wrong
Show solution
Correct answer to question 13041
- A: It stays the same
Explanation
Voltage drop is proportional to the product I x L (VD = 2 x K x I x L / CM). Doubling L and halving I leaves I x L, and therefore VD, unchanged.
More questions: Electrical Calculations
- 13042What voltage corresponds to a 3 % voltage drop on a 208 volt branch circuit?
- 13043In the common voltage drop formula VD = 2KIL / CM, what K value is normally used for aluminum conductors?
- 13044A three-phase 208 volt circuit of 10 AWG copper (10,380 circular mils) supplies 25 A per phase at 120 feet one way. What is the percent voltage drop?
- 13045A 120 volt, 20 A load is 150 feet from the panel. What is the smallest copper conductor that keeps voltage drop at or below 3 %?
- 13046What is the allowable ampacity of 6 AWG THHN copper (90 °C column) with three current-carrying conductors in a raceway at an ambient temperature of 40 °C?
- 13047Six current-carrying 10 AWG THHN copper conductors share one raceway at 30 °C ambient. What is the adjusted ampacity from the 90 °C column?