Question about Circuit element in pencil sharpener

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SUMMARY

The discussion centers on the internal workings of a battery-operated pencil sharpener, specifically focusing on a circuit element that consists of two metal strips. The first strip, connected by a red wire, is theorized to magnetize and attract the second strip when current flows through it. The conversation also explores the possibility of multiple plate pairs being involved in the circuit activation process, particularly in relation to the mechanical action of the pencil pushing down on the device.

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  • Basic understanding of electrical circuits
  • Familiarity with battery-operated devices
  • Knowledge of electromagnetic principles
  • Experience with mechanical switches and their operation
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  • Research the principles of electromagnetism and how they apply to circuit elements
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Electronics enthusiasts, hobbyists dissecting battery-operated devices, and anyone interested in understanding the mechanics of circuit elements in everyday appliances.

joshua17515
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Hey guys I'm dissecting this pencil sharpener to see how it works. I understand every component except one. The sharpener is battery operated, running on 4 AA's and once the current leaves the battery you can trace the wire to a small platform containing two elements connected. The first element is the one I don't understand current travels directly to it through a red wire, it is one small strip of metal that is slanted with a gap between it and the strip of metal in the second element. My theory is that as the current flows into the first element electrons build on the end magnetizing it causing it to be attracted to the other part and connecting them, thus completing the circuit. It seems like it would work I just don't understand why you would have to do that, the next element is similar type switch with a gap, this one appears to be activated when the pencil pushes down on the device though.
Is my theory for the first component close? Do you guys have an idea. I'll try to draw a picture I know it would help understand my question.
 

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Maybe a picture of the device would make it a little easier.
 
No, it would take a LOT of voltage to get enough charge to bend a metal plate. And before that happens, you'd get arcing as electrons simply fly across the air between the plates.

My first guess was that the pencil would push the metal plates together, but you have already found another plate pair where that happens.

Is it possible that there are two plate pairs that the pencil must contact?

p.s. welcome to PF :smile:
 

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