There is a spring attached to the door on Elijah’s front porch. Elijah opens
the door stretching the spring (1). After walking through the doorway (2),
Elijah lets go of the door, and the spring contracts, pulling the door shut (3).
Describe an energy transformation that took place in each in each of the
numbered events above.

um, this needs to be more clear, i dont understand at all...

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation: