Electrical current running through a wire causes that wire to heat up.
If the wire heats up it can damage the insulation or cause a fire.
Electrical current running through a wire can damage the insulation or cause a fire.
Electrical current running through wire can do what or cause a fire?

  check the wire
  damage the insulation
  cool the wire
  get chemical reactions started
  kinetic energy
  move the wire
  activation energy
  get started