Advanced Qualification · A-001 Advanced theory · A-001-002-001
What is the result of skin effect?
- A As frequency increases, RF current flows in a thinner layer of the conductor, closer to the surface
- B As frequency decreases, RF current flows in a thinner layer of the conductor, closer to the surface
- C Thermal effects on the surface of the conductor increase impedance
- D Thermal effects on the surface of the conductor decrease impedance
Correct answer: A — As frequency increases, RF current flows in a thinner layer of the conductor, closer to the surface. From the official ISED question bank, verified word for word.
Why
Skin effect happens because higher frequency radio waves push the electrical current toward the outside of a wire, leaving the centre mostly empty. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced theory: time constants, reactance, impedance, resonance, Q, and the mathematics behind tuned circuits.