Steve Spangler Science

Back to School Learning:    First Days of School Kit  •  Free Experiments  •  Holiday Shipping Notification

Steve Spangler Science will be closed Monday, September 1st for Labor Day.

No shipments will be sent or received on that day and deliveries in transit will take 1 additional day to arrive. Normal business hours will resume Tuesday, September 2nd at 8:30 AM MST. We are sorry for any inconvenience.

Questions? Give us a Call: 1-800-223-9080

Build a Light Bulb - Circuit Science

Create a battery-powered light bulb from household items

Rating: 43211

Submit A Review

When you are conducting experiments and demonstrations using electricity, you'll use the science of circuits. Amazing things are possible with circuits including alarms, radios, and lights. In the Build a Light Bulb experiment, you'll use household items to construct a complete circuit that results in a homemade light bulb.

Materials
  • Eight D-sized batteries
  • Mason jar or other clear glass
  • Electrical tape
  • Pie pan
  • Scissors
  • Toilet paper tube
  • Mechanical pencil refills
  • Two sets of small alligator clips

Videos

  • Build a Light Bulb - Sick Science! #079
Print Experiment

Experiment

  1. Using electrical tape, fix eight D-sized batteries together, end-to-end, with the positive ends connected to the negative ends. You've made a super battery!
  2. Use scissors to cut a toilet paper tube to a height that will fit comfortably (leave plenty of room) inside of a mason jar or other clear glass.
  3. Tape one positive and one negative alligator clip to one end of the toilet paper tube. Make sure the clip is facing up, away from the rest of the toilet paper tube.
  4. Tape the tube with the clips attached to a pie pan so that it stands upright, with the clips facing up.
  5. Carefully clip a mechanical pencil refill between the two alligator clips. The pencil refill needs to be in one piece, so be gentle.
  6. Place a mason jar or clear glass over the top of the toilet paper tube stand.
  7. Touch the other positive and negative ends of the alligator clips to the ends of your super battery.
  8. Give the circuit a moment to circulate the electricity and… voila! The pencil refill begins to glow.

How Does It Work?

When you touch the free ends of the alligator clips to your "super battery," you form a complete circuit. That means electricity flows freely through the entire apparatus that you have just built. This flow of electricity channels through the graphite-based mechanical pencil refill that is connected by alligator clips. The flowing electricity has a noticeable effect on the pencil refill. The thin refill begins to glow and give off smoke. This happens because the electricity heats the graphite refill to an incredible temperature. So, if you are hoping to save some money by using your own homemade light bulbs around the house,stick with the store bought ones. It's not as cool, but it is safer.

Customer Reviews

spectacular results Review by al domz
43211

Me and my group mates presented to our class as part of our simple process demonstration. Everyone was amazed by our presentation. Instead of the d size batteries we used the square battery of a spot light....it really worked and the pencil lead was actually really hot..one of my group mates touched it out of curiosity and got a small burn...i already warned him but he did not listen...anyways the presentation was successful.

(Posted on July 19, 2012)

Light bulb review Review by Ami
54321

Awesome! Is the smoke from the graphite burning as it is conducted through the resisting filament until the oxygen is used up? Then it glows! It sure takes a lot of energy for this light bulb!

(Posted on March 14, 2012)

Question Review by Student
43211

I tried it and it did work, but have a question, how does the energy transfer through the lead? Or why does it transfer?

(Posted on March 26, 2012)

Perfect Timing! Review by Amy Lyttle
54321

I have just started teaching electricity and this will be a fantastic demo to add to my lesson!

(Posted on March 14, 2012)

great Review by Eva
54321

just like the bulb in the microwave experiment, this is great. We are so accustomed to ordinary bulbs, it is great fun to see the variations on the everyday reality.

(Posted on March 14, 2012)

great Review by MILE
54321

tHIS PROJECT IS LEGIT

(Posted on April 25, 2012)

Lightbulb Experiment Review by Dawn Hardy
43211

My second graders used .7mm leads and the experiment worked beautifully! We actually did the experiment a few times using different battery combinations with interesting results. There really is a difference in brands. This was great!

(Posted on May 17, 2012)

WOWIE Review by Cail
43211

Wow, i did this experiment times, it worked 8 times and i was very impressed. the thiker the lead, the better it works!!

(Posted on May 21, 2012)

Lots of Trial and Error Review by Richard Moore
43211

I noticed the first reviewer had trouble getting this to work. I did as well. I went back and forth to the office supply store to buy various brands and widths of lead. Still didn't work! After 3 hours I simply gave up.
The next morning before school I taped together 10 D batteries, made sure my wires were conducting, used Papermate .5mm lead, used new tight alligator clips, and a much smaller jar. Worked perfectly! I used .7mm as well. Then I used a very thick lead shaved from an HB pencil. It took 18 volts, but worked. Couple this with Time Magazine's Man of the Year article on Thomas Edison and you've got a pretty good lesson in reading, critical thinking, and of course, science.

(Posted on December 11, 2012)

didn't work despite troubleshooting Review by Cristy
14321

I could not get this to work. I did not have D batteries around, but I tried it with 8 or 9 C batteries, 1 or 2 big square lantern batteries, 8 and 16 AA batteries... basically lots and lots of battery combinations. I would see smoke, but now glowing. I tried a little motor between the clips to make sure my circuit was good, and it was fine. Tried with a jar and without a jar, even tried replacing the O2 in the jar with CO2 via vinegar/baking soda gas "poured" in to it. Put some Nichrome wire between the clips and got a little glow, but just orange wire. Nothing impressive. I would test this in advance to not end up with disappointed kids. I am a pretty disappointed 40-something!

(Posted on November 5, 2012)

Write Your Own Review


You're reviewing: Build a Light Bulb - Circuit Science


How do you rate this experiment? *
1 star 2 stars 3 stars 4 stars 5 stars