In this instructables, we will make a pen that writes using electricity. The required material is easily available.
Step 1: Collecting the Material!!
The material required is easily available :-
• 1 cup water
• 2 tablespoons common salt
• 1 tablespoon turmeric
• Metal plate or steel dish
• Paper towel or tissue paper
• 9 v. battery or mobile charger
• Safety pin (optional)
• Plastic pen refill
• Sticky Tape
Once you are ready with the material, you can go ahead!!
Step 2: Mixing Chemicals!!!
Add salt in water, till no more of salt dissolves.
It will be a saturated solution.
Now add 1 tablespoon turmeric with 1 tablespoon of salt water.
Mix it to make a paste of turmeric.
Step 3: Preparing Paper!!
Soak the tissue paper in salt water.
Carefully place the tissue paper on the metal plate.
Put and spread a thin layer of turmeric on the tissue paper.
Step 4: Making the Pen
Attach a safety pin to the terminal wire of the charger
Step 5: Writing!!!!
Here's the most awaited part of this instructable.
On the switch of the mobile charger and write using the pen.
The pen writes in red color.
You can also see this project on YouTube on the link below
Step 6: Explanation
So, how does the pen writes using electricity.
This is because of electrolysis of water. Since water is not such a good conductor of electricity so we added salt (an electrolyte).
During electrolysis of salt water, Sodium hydroxide (NaOH) a base is produced. Turmeric, an indicator turns red when come in contact with a base. So when we touch pen with tissue paper, electrolysis happens only in touched area.