If the cross sectional area of a cable is increased, what will happen to the voltage drop?
- Decrease.
- Increase.
- Stay the same.
Explanation
Resistance is inversely proportional to cross-sectional area, so increasing a cable's CSA lowers its resistance. Since voltage drop equals current times resistance, the drop along the cable decreases for the same current. This is why larger conductors are chosen for long runs to keep voltage drop within limits.
Azfar asking:
why does the voltage drop decreases? According to my understanding, V=IR. When cross sectional area increases, resistance will increase, hence increasing the voltage. Are voltage and voltage drop both different things?
Community Comments (2)
D
dimky Posts: 514 04.09.2013 / 21:20
If cross-sectional area is increased - resistance is decreased.
A
Azfar Posts: 3 04.09.2013 / 21:23
ok..thank you
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