what can you buy with a coin?many things like aa batteries,aaa batteries ,button coins etc etc.but can you make a battery with the coin itself?no?then i am here to share how to make it.it is a small project no soldering no hazards .excited?so lets start
Step 1: Ingredients
the things you will need are:
1)a cent of usa (that is 1/100 of dollar)=6-7(depends on the voltage you want to make)
2)a sand paper of 100 grit.
3)a thin piece of cardboard
5)a cup of water and some salt(if you have vinegar then ignore)
6)a led for testing
Step 2: Which coin to be chosen?
not any coin to be chosen.the cent or usa penny is to be chosen and the coin should be after 1982 .other wise it wont work.because the cents made after 1982 consists only a small coating of copper and 98 percent zinc inside.copper will extract positive charge and the zinc will extract negative charge.the coins made before 1982 consists of 95 percent copper.
Step 3: Lets make the anode and cathode
anode and cathode are negative and positive charge extracting sides.the anode and cathode both are present in the cent.to expose the zinc we have to remove the copper face of one side.so take a sand paper and using it sand of one side of the cent.it is the hardest part of the project.
Step 4: Lets prepare the electrolyte!
first put the coin on a piece of cardboard and then take its outline.then cut it out.cut the same amount of of pieces as many you have used the coins.
if you have vinegar then ignore the next step
Step 5: Making the electrolyte part 2
now take a bowl of water and keep mixing salt with it until it stops to dissolve.now dip the cardboard pieces into it
Step 6: Putting the cell together!
now lets put the cell together.firstly i put aluminium foil on the floor to make it act like a wire and also to keep the floor dry.now firstly blot the excess salt water from the cardboards and put them at the floor.now put the coin on the cardboard so that the copper side is facing towards the cardboard and the bare side or zinc side is facing upwards.now again put another cardboard on the coin and then again place another coin on the cardboard in the same manner.Its ready!
each coin and cardboard will produce 0.5 volts and stacking six of them will give you 3 volts which is enough to light up a led.
Step 7: Testing!oh no!
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so as our cell is ready lets test it.attach the leads of led to the battery and wow!it works.it lights up!
hope you liked my instructable.i am not english men and so i do not know english much.so any mistake help me correct it.give new creative ideas to do with the battery.thanks for watching it.
i am argha halder.class 7 .13 years old.i read in biam laboratory school naogaon bangladesh.thanks for watching and further commenting