What can cause the pitting or welding of...

Question 1 of 270705eccefa4bacbc34ba4d48505

What can cause the pitting or welding of controller contacts?

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Question 1 of 27070

Q

What can cause the pitting or welding of controller contacts?

🔍 Key Concepts

• electrical arcing at the contacts when they open/close • effect of contact pressure on resistance and heat generation • how loose vs overly tight contacts affect sparking and wear

💭 Think About

• Think about when you unplug a device under load and see a small spark. Under what condition at the contact surfaces does this sparking (arcing) become worse? • Which condition would increase resistance at the contact point, causing more heat and a greater chance of tiny weld spots forming between the contacts? • Which options directly change the physical touching of the contacts, and which only change the general environment around them?

✅ Before You Answer

• Identify which choices actually change contact resistance at the touching point. • Decide which condition is most likely to increase arcing and localized heating at the contacts themselves. • Eliminate any options that mainly affect the surrounding air temperature rather than the mechanical/electrical quality of the contact.