Electrically conductive film

An electrical heating device comprising:

• one or more electrically conductive films comprising:
• an electrically nonconductive substrate layer;
• and
• an electrically conductive metal layer that has a structure produced by material removal and that on a first side is joined, at least in sections, to the electrically nonconductive substrate layer;
• wherein the electrically conductive metal layer is made of copper, a copper alloy, aluminum, and/or an aluminum alloy;
• wherein the electrically nonconductive substrate layer is made of a polyethylene naphthalate or polyethylene terephthalate;
• and
• wherein the structure of the electrically conductive metal layer includes one or more strip conductors, and at least on strip conductor includes multiple strip conductor sections whose strip conductor widths differ from one another.