Find Out How to Make a Potato Light

· November 17, 2016
While the potato light can be used to illuminate a room, some people don’t see any purpose for potatoes other than as a food.

If you liked your science classes when you were in school, then this little experiment is for you.

All you need is a potato. When you add some simple materials that you can find at the hardware store, this starch can become a batter that creates an element in the new generation of ecological houses.

Haim Rabinowitch, of the Hebrew University of Jerusalem, Israel, has been working for years to create a device capable of extracting the energy that’s stored in potatoes.

This study was born from the idea to help people who don’t have access to electrical grids.

According to Rabinowich, you simply connect this root vegetable to a pair of wires, screws, and of course, an LED bulb to provide artificial light in a variety of spaces.

The study found that a single potato light could be used to illuminate a room for approximately 40 days.

How to make a potato light


What do you need?

  • 2 small potatoes (cooked for 8 minutes)
  • 3 copper wires
  • 2 copper rods or wires
  • 2 zinc rods or nails
  • 1 small bulb, 1.5 y

How to make it?

  • Wrap the copper cables around the two wires or copper rods.
  • Stick each one into a potato.
  • Wind the third copper wire around the zinc rod and insert it into one of the potatoes.
  • Take the tip of the copper cable in this potato and wrap it around the other zinc rod.
  • Place this last zinc rod in the second potato.
  • Place the two ends of the wire that are loose in contact with the bulb (be careful not to touch the copper).
  • Ready? It lights up the room!

See also: how to make a light jar to decorate your rooms

How does it work?


The potato doesn’t actually generate electricity. It contains ascorbic acid. This component, together with a copper electrode and zinc, results in electrons moving from one place to another using this natural product as the power drive.

This phenomenon is known as a “redox reaction,” and has the ability to turn on and power various electrical appliances.

“Potatoes are chosen because they can potentially be grown almost everywhere, including tropical and subtropical climates. They are the most abundant crop in the world.”

-Haim Rabinowitch –

Some history on the potato light

According to Rabinowitch, while potatoes are the number one food used in schools to teach children about science, no one had yet conducted a study on using this tuber as a source of energy.

Physicists Alessandro Volta and Luigi Galvani had already studied different methods for generating energy back in 1780, such as:

  • Paper soaked in salt water.
  • Making “batteries” using two metal plates and a lot of soil, or a bucket of water.

We recommend you read: 5 ideas to recycle plastic bottles

The mystery of the potato light


If this experiment demonstrated the function and utility of the potato light then why hasn’t it begun to be used everywhere?

According to Rabinowitch, they just need “research and dissemination so that people will begin using potatoes to produce large amounts of energy, especially in areas where electricity is not available.”

However, there are many people who oppose this method to generate electricity from food.

Biodiesel, which critics argue takes food away from hungry or famine-affected populations to produce energy, is considered to not be a successful or appropriate decision.

Statistics show that there are around 360 million tons of potatoes produced a year throughout the world, however. In addition to being easy to store and long lasting, they are cheap to produce.

It is precisely for this reason that this kind of technology could be economically viable to develop and implement in places that lack electricity.

The manufacture of zinc and copper rods is also a little cheaper than a kerosene lamp. The problem, however, lies in the fact that using food to light up a room doesn’t appeal to the majority of the population.

“It’s a low voltage supply, but it’s enough to build a batter that could charge mobile phones and laptops in places where there is no electricity.

-Haim Rabinowitch –