Do you have an idea for a High School Science Fair question dealing with electronic circuits?

Question

Trying to come up with a Question for a High School Science Fair using circuits...like "will transistors work more effectively if you cover them with peanut butter?" ...we don't have access to a lot of sophisticated test equipment. Any brilliant ideas from teachers or engineers (or Science Fair Winners)??? NEED BEFORE MONDAY!!! (just the question, not the finished product)

Answer 1

Boy do I have ideas. Let's start with your approach to the fair. Next we'll look at various projects. Try to follow the scientific method. Formulate a hypothesis. Test. Document. Test. Analyze. Test. Document.
You get the idea. That is not the scientific method, but it is close enough for this question. Your hypothesis does not have to be correct to be placed. You have to show why the experiment succeeded or failed. You have to show what might be done differently if it did fail. You have to show that you learned something.

Projects: analog versus digital. Which is better? When is one better than the other? Is there a place for analog circuits in today’s digital world?
Is smaller always better? Electronics are getting smaller all the time. The end result is much less volume and surface area. With a reduction of surface area comes a reduction in the ability of matter to release excess energy or heat. Heat kills electronics and other things.
How do magnetic fields interact with electricity? How does electricity produce magnetic fields? How might magnetic fields produced by one wire or circuit interact with or influence a separate circuit? Interference?
Is tube technology obsolete? Is there a place in this world for tubes instead of semi-conductors? Power applications perhaps.
Which is better regarding power, high voltage with lower current or high current with lower voltage?
How are crystals used in electronics? Do they generate electricity or do they generate vibration?
Math in electronics: what are the benefits of using number systems other than base ten or decimal? Why use binary or hexadecimal instead? What does that do to arithmetic operations? How do you perform arithmetic operations with binary circuits? How do binary circuits make decision? What are logic circuits? How do they help circuits make decisions?
Which is more important, the speed of the circuit or the simplicity of the circuit? Which is better, to add by counting or to add by arithmetic operations in one step? One is slow; one is complex.

Answer 2

Here are a couple of ideas. The first one is how heat impacts circuits -- do they perform better cold or warm?

Second and more advanced question. How do you design circuits that use less power and generate less heat while being more powerful? Intels new Dual Core 2 architecture does this with less heat on a smaller die. How do they accomplish this?

Answer 3

what is the difference between AC and DC and how thay can be converted in to each other ( cell phone battery)