Exam-style question
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What is the main cause of signal loss in a copper cable?.
- A.Capacitance between the conductors.
- B.Inductive coupling with nearby cables.
- C.Resistive heating of the conductors.
- D.The presence of ferrite cores.
Model answer
What a good answer should say
- Resistive heating of the conductors.
Explanation
Why this works
Formula: V_drop = I × R_line. Substitution: I = 2 A, R_line = 5 Ω.
Working: V_drop = 2 × 5 = 10 V. Answer: 10 V.
Units/conclusion: V. The voltage drop reduces signal amplitude, causing attenuation due to resistive heating.
Common mistake
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