Which of the following terms refers to the very small movement of terminals against each other that wears away the outer layer of the metal?

A) continuity
B) thermal cycling
C) resistance
D) fretting

Fretting

Wear at the contact surfaces of two materials that occurs from repeated cyclical motion or vibration, often seen in electrical connections.

Thermal Cycling

A pattern of heating and cooling that, over time, can cause resistance to build up in electrical connections.