To deal with electronic and textile, fashion and technology, it’s important to understand some basic of electricity and especially when you will start to build sensors or make circuit.

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When you understand how electricity behave, you realise that you can easily re-create some everyday life objects like a speaker.

and if you use conductive thread instead of regular wire, you can make a speaker entirely in textile or this tutorial. In this case it’s excessively interesting because the fabric  became a actuators.

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Useful links:
Flat spiral coil inductor calculator 

Ref:
The crying dress by Kobakant (making of)

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With the principle of a basic circuit with a spiral and a magnet we can also create a movement.
A magnet have two poles (North and South) and when you send electricity into the spiral you create an electromagnetic field with a polarity.
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Like the principale of a solenoid, if you change the way of the current once you attract the magnet and to the other you repulse it so you create a movement.

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Using this system, Ebru Kurbak and Irene Posch made this beautiful project Crafted logic.