You are presented with the quiz "Electrical current running through wire can do what or cause a fire?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "electrical current running through a wire causes that wire to heat up" and "if the wire heats up it can damage the insulation or cause a fire". 

So, what's the best answer to the question?


 

  damage the insulation         