to be lit (e.g. electricity comes on); to be lighted; to catch fire
to turn on; to switch on; to light up
to ignite; to set fire to; to spark (an incident, etc.); to inflame (a situation, etc.)
to catch fire; to provoke; to catch fire from; to be ignited
leaving a device on (e.g. TV, air conditioner); leaving something engaged (e.g. a key in a lock)
to turn on an electric light; to switch on a light