Kiểm tra & Khắc phục sự cốCâu 490 / 521
A conductor run carries 10 A and the total round-trip resistance of the wire is 0.5 ohms. What is the voltage drop along the conductors?
a.20 V
b.0.05 V
c.10.5 V
d.5 V
Giải thích
Voltage drop Vd = I x R = 10 A x 0.5 ohms = 5 V. Option a divides I by R inverted, b divides R by I, and c adds the numbers, none is Ohm's law applied to the wire resistance.
Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- You test a 480 V motor with a 500 V megohmmeter and read 0.4 megohms. Using the common one-megohm-per-kilovolt-plus-one-megohm minimum guideline, is the insulation acceptable?
- Which instrument lets you measure the current in a single energized conductor without disconnecting or breaking into the circuit?
- A DMM reads 12 V across a resistor and a clamp meter reads 3 A through it. What is the resistor's value?
- Three resistors of 10 ohms, 20 ohms, and 30 ohms are wired in series. What is the total resistance the ohmmeter should read across the string?
- Two 20 ohm resistors are connected in parallel. What total resistance will an ohmmeter read?
- The 2023 NEC added a requirement on how terminations must be tightened when the manufacturer provides a torque value. What does it require?
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với California CSLB C-10 Electrical Trade Examination · Quy trình kiểm tra