USCG Exam PracticeDC circuits and electronic principles
A conductor is replaced with one of the same material and length but twice the cross-sectional area. According to Ohm's law principles, what happens to the conductor's resistance?
- A. Resistance doubles.
- B. Resistance is unchanged because the material and length are the same.
- ✓ Resistance is reduced by half.Correct
- D. Resistance increases by the square of the area change.
Why C is correct
Resistance depends on material, length, and cross-sectional area; a thicker conductor (greater area) has less resistance. Doubling the cross-sectional area halves the resistance. (NEETS Mod. 1 §3-1)
Cited:NEETS Mod. 1 §3-1