Number LED 4
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Number LED

Number LED 1Number LED is an easy science experiment using LED’s! Choose any number that you want to make on your breadboard and learn the basics of a bread board.
In this experiment, we have to make connections in a bread board and make the LED glow. To make the experiment interesting, connections will be made in the form of numerical digits. We have chosen 1962, the year in which the first LED was used.

Safety First! Adult Supervision Required. Don’t Eat/Drink your Experiments, Wear safety goggles where ever required


Materials and tools required.

Number-LED-Experiment-Step-0In the box

  • 9 V battery
  • Bread board
  • Bread board pattern sheet
  • Wire roll (yellow ,red, black, green)
  • LED
  • Two way tape
  • Snap connector
  • Wire Cutter
  • Forceps
  • Multimeter
  • Scissors
  • Marker
  • Sketch pen
  • Measuring scale

Video on Youtube for the Experiment

What to Do ?

  1. Make a mark near 12A, 20A, 23A, 30A, 33A, 40A, 43A, 50A on the bread board pattern sheet.
  2. Draw a horizontal line connecting 20A and 20E. Now use a different colored sketch pen, and join 20E and 20J. You will get digit 1.
  3. Join 30A with 23A, 30A with 30E, 30E with 23 E, 30E with 30 J, 23A with 30A and 30J with 23J. You will get digit 2.
  4. Join 33A with 33E, 33E with 33J, 33J with 40J, 40F with 40J and 33F with 40F. You will get digit 6.
  5. Finally, you will get ‘1962’ drawn on the bread board pattern sheet.
  6. Mark 2cm and 2.5cm on the wire and cut the pieces using a wire cutter. Repeat this using yellow and green wire.
  7. Now remove the insulation at the ends of the wires by using a wire cutter.
  8. Cut sixpieces of 2.5 cm green wire, eight pieces of 2.5 cm yellow wire, two pieces of 2 cm green wire and three pieces of 2 cm yellow wire and keep them in separate bowls.
  9. Carefully observe the ‘1962’ digit made on the bread board pattern sheet and work it out in the breadboard using wires.
  10. Check the continuity of the connections by using a multimeter.
  11. Cut strips of black and red wire and remove the insulation like you did for the other wires. Mark ‘+’ sign on the top part and mark’-‘ on the lower part of the bread board.
  12. Use red wire to join the ‘+’ terminal and black wire to join the ‘-‘terminal on the bread board. The purpose of doing this is to join the bread board, which is separated in the middle.
  13. Join 20 J with the ‘-‘ terminal hole using black wire, 30 J with ‘-‘ terminal, 40H with ‘-‘ terminal and 50H with ‘-‘ terminal.
  14. Take LED, the longest terminal in LED is the ‘+’ terminal and the shortest terminal is the ‘-‘.Insert the + terminal of the LED in the positive holes /terminal of the bread board and negative terminal in 20 A Hole.Similarly insert the ‘-‘terminals of LEDs in the holes 30 A, 40A and 50 A as you did before.
  15. Now insert the resistor in one of the holes, just after the one in which you have connected the black wire in the ‘-‘terminal. Function of this resistor is to protect the LED from high 9 V of the battery.
  16. Now remove the cover of the two way tape and attach the 9 V battery to the side wall of the bread board.
  17. Now connect a snap connector to the 9 V battery and insert the red wire in the ‘+’ hole and black wire in the ‘-‘ hole of the bread board. You will see the LED glows!
  18. Using forceps remove the green wire connecting 20F and 20 J.The bulb stops glowing because these two holes are not internally connected through plates in the bread board,but were connected by external wire.Fix the wire back. Similarly, remove the yellow wire connecting 50A and 50E, this time you will notice that the LED did not stop glowing, this is because these two terminals are internally connected in a bread board.Fix the wire back.
  19. Now remove the yellow wire connecting 43E and 50 E the LED did not stop glowing, this is because these two terminals are internally connected in a bread board .Fix the wire back.
  20. Again remove the yellow wire connecting 43 E and 43J.The bulb stops glowing because these two holes are not internally connected through plates in the bread board, but were connected by external wire. Fix the wire back.

Images for Instructions

Working Principle of Number LED :

In this experiment, the main element is the bread board. This experiment focuses on understanding the connections of a bread board. A bread board has four parts.
Two parts are used for connections to the battery and are known as Positive Line and Negative Line. The other two parts are used to give connections to LEDs so that they can glow! The fun part is to remove some connections and still make the LED’s glow as they are internally connected in the breadboard.


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