Answer:
What you do to determine the length of something
You can draw me, fire me or fill me in.
Hearing something unexpected or touching a live wire can have this effect.
Casper was a friendly one and Demi Moore made a clay pot with one.
When I type I tap these on the keys
Break me and I am better immediately set and harder to be broken again.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?