Answer:
A squiggly line tells you when you've done it wrong
You are on an electric train. Which direction will the smoke fly in?
The more you have of me, the less you see. Who am I?
What does someone else have to take before you can get?
In your fire you hear me scream! Creaking and whining yet I am dead before you lay me in your hearth.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?