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analogy explanation of electronics

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MrDEB

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Come March 13th & April 10th I am teaching the Boy Scout merit badge for electronics (could include electricity as well) and got to thinking "IS THERE A BETTER EXPLANATION OF CURRENT< VOLTS< RESISTANCE" than the old water hose explanation?
For a project they have to build and explain the parts used. I plan on using my 7 key toy organ I devised last month. The attached schematic is with the addition of Knight Rider LEDs which are not included in project.
All the parts for 15 units w/ shipping =$41
add for copper boards and project comes out at under $5 per.
Lots of drilling unless I stack the boards(blot together then drill)
Anyway any other creative way to explain basic ohms law?? other than the water hose??
 

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The water analogy seems rather good to me. What do you have against it?
 
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