🔍 Key Concepts

• Magnetic motor controllers and how their contacts open/close under load • Effects of heat and arcing on electrical contacts • How overcurrent or overload conditions affect contact surfaces

💭 Think About

• When electrical contacts carry current and open/close, what physical effect can cause the metal surfaces to fuse together? • Which option would most likely increase heat and arcing at the contact surface, rather than simply preventing operation? • Think about which condition directly affects the contact faces themselves, not the coil or magnetic circuit alone.

✅ Before You Answer

• Identify which choice would lead to overheating and arcing at the contacts specifically. • Eliminate any options that mainly affect the coil magnetism but not the contact surfaces fusing. • Ask: under which condition would the contacts be more likely to melt slightly and stick together during heavy current flow?