[误] The room is lighted with electricity.

[正] The room is lighted by [means of] electricity.

. The room is lighted with electric lamps.

注：用于无形的手段时要用 by，所以与抽象名词连用，但用于有形的手段时则用 with，所以与普通名词连用。 electricity 为抽象名词，electric lamps 为普通名词。