"alternating"
That is called an alternating current.
No, that's Alternating Current.
Instructions
A thermister is a device that changes resistance depending on temperature. A photo resistor changes resistance based on light. Both of these could be used with an amplifying circuit to vary current flow.
Yes you can. The price changes almost daily. Call your local wrecking yard for current prices.
stage directions
An 'itinerary' is a planned route or journey - which would possibly include driving directions.
Someone who is good with directions is often called "having a good sense of direction."
The price probably changes weekly if not daily. Call a local wrecking yard for the current price.
The uneven cooling and heating of the Earth by the Sun cause seasonal changes in wind direction. The heating and cooling causes temperature differences that then develop into wind currents.
weathervanes
A regular octagon
If it comes with directions, follow those directions. If not just call sears.