Before revision: Electrical contact resistance (ECR, or simply "contact resistance" ) is resistance to the flow of electric current caused by incomplete contact of the surfaces through which the current is flowing and by films or oxide layers on the contacting surfaces.
After revision: Electrical contact resistance (ECR, or simply contact resistance ) is resistance to the flow of electric current caused by incomplete contact of the surfaces through which the current is flowing and by films or oxide layers on the contacting surfaces.