Question

Wire-wound resistors are unsuitable for use at high frequencies because
1. They are likely to melt under excessive eddy current
2. They exhibit unwanted inductive and capacitive effect
3. They create more electrical noise
4. They consume more power

Answer 1

Correct Answer - Option 2 : They exhibit unwanted inductive and capacitive effect

Reason for not using Wire Wound Resistance at high frequency:

• A wire-wound resistance consists of a various number of turns around it.
• If there is a number of turns in the element then it acts as an inductor.
• But due to less number of turns very small inductive property exhibits in the wire-wound resistance.
• As frequency increased then the inductive properties also increased proportionally because of inductive property proportional to the frequency.
• At higher frequency, wire wound resistors exhibit the unwanted inductive and capacitive effect.