USCG Exam PracticeDC circuits and electronic principles
A series circuit contains three resistors: R1 = 10 Ω, R2 = 20 Ω, and R3 = 30 Ω, connected to a 120 V source. What is the voltage drop across R2?
- A. 20 V
- ✓ 40 VCorrect
- C. 60 V
- D. 80 V
Why B is correct
Total resistance = 10 + 20 + 30 = 60 Ω. Current = 120 V / 60 Ω = 2 A. Voltage across R2 = 2 A × 20 Ω = 40 V. Kirchhoff's voltage law confirms: 20 + 40 + 60 = 120 V. (NEETS Mod. 1 §3-2)
Cited:NEETS Mod. 1 §3-2