Can I use capacitors to create a magnetic field with a transformer and coil?

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Discussion Overview

The discussion revolves around the feasibility of using capacitors in conjunction with a transformer (or inverter) to create a magnetic field through coils. Participants explore the implications of charging capacitors with AC voltage and the potential issues arising from the setup.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Zig describes a project involving a 12-volt battery connected to a transformer producing 120V AC, with the intention of using capacitors to create a magnetic field.
  • Some participants express concern about the safety and practicality of the project, suggesting that connecting capacitors across AC is ineffective as they will charge and discharge with each cycle, resulting in no net charge.
  • Dave advises against using a transformer with a DC supply, indicating that it could lead to shorting the supply and potentially damaging components.
  • A later reply questions whether Zig meant to refer to an inverter instead of a transformer, highlighting the risks of connecting polarized capacitors to AC voltage.

Areas of Agreement / Disagreement

Participants generally agree that connecting capacitors directly across AC is not effective and that there are safety concerns with the proposed setup. However, there is no consensus on the best approach to achieve the desired outcome of creating a magnetic field.

Contextual Notes

Participants note the potential dangers of the project, including the risk of damaging components and the confusion between using a transformer and an inverter. There is an acknowledgment of the limitations of using AC with capacitors in this context.

Ziggey
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Hello.

So I'm trying to work on a project with capacitors. I have a twelve volt battery hooked up to a transformer that produces 120 v ac.

I would like to then hook the transformer up to five capacitors in parallel and then use the power stored i the capacitors to shoot through my coils to create a magnetic field. Something is going wrong though and I don't know what.

ImageUploadedByPhysics Forums1409391537.835094.jpg


Any help would be great. Am I going to be able to just charge the capacitors up? I know that when running ac the capacitors are constantly charging and discharging. When I hook it up though the transformer makes a noise like I'm shorting something out... :/

Thanks for any help,
Zig
 
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sounds like a bit of a dangerous project

putting capacitors across AC is pointless as each plate of the capacitor will be charging and discharging with each cycle of AC ( as you discovered) so you will end up with zero charge on them

forget the transformer and charge them directly from a DC supply

Dave
 
Ziggey said:
I have a twelve volt battery hooked up to a transformer that produces 120 v ac.
Do you mean an inverter? If you hook up a DC supply to a transformer, you'll just short out the supply.

Ziggey said:
When I hook it up though the transformer makes a noise like I'm shorting something out... :/
If you manage to hook up that level of AC voltage to your polarized caps, you're probably just going to see a lot of smoke.
 
Yes sorry I meant inverter... Ok I will have to modify my plan a little then thank you all for the help!

zig
 

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