The Relay
December 10, 2025 • EPISODE 290
How does a simple relay help us understand electricity and circuits? In this episode of Science LIVE, Roger Billings breaks down the science behind the relay—the clever electromagnetic switch that makes it possible to control circuits with precision. Learn how relays work, why they’re essential in everyday electronics, and how this simple idea became a building block for modern technology. A clear, hands-on look at one of engineering’s most important tools.
About DrB
Dr. Roger Billings is a visionary innovator whose work has touched the lives of millions of students and transformed the landscape of education. Widely known as “DrB” to the countless kids who benefit from his groundbreaking Acellus learning system, Dr. Billings has dedicated his life to advancing education through technology.
As part of DrB’s lifelong commitment to supporting education, Science LIVE was launched as a way to “give back” by mentoring students in conjunction with the Roger Billings Scholarship Program.
Read more about DrB »
About the Roger Billings Scholarship Program »
This was great to learn about, I love watching these!
Cool! My dad always uses wd40.
I am always so excited to watch science live every week!
I love when you had the spoons and was playing the song jijnel bells so fun
I really loved the part about WD40! It was very interesting!
r 51 is hilarious
we have WD-40. My dad has it
Thanks. My dad and grandfathers all use WD40.
“Electricity knows me on a first name basis and it calls me sir.” *Gets zapped* “I stand corrected, it calls me conductor.” Is such an amazing joke.
Another great Science Live as always!
I love acellus
I love watching science live.
WD40 is so fascinating!
Dr. Billings sooooooooooooooooooooo intellectually inventive🤯😎🤩
man they say albert eynstine is smart but they havnt seen Dr billings yet
I love learning in the technology spotlight.
Science is so cool!
I love the story of wd 40 so cool!
AMAZING!!!!!!!!!!!!!!!!!!!!!!!!!!!
Thank you Dr. Billings!
Dr. Billings your so smart!!!!😊
My dad uses WD40
I like learning about radio waves,
This science live is so good! Thank you!
I always look forward to science live!!
r-51 rocks!
Science is so cool
I love science live!
I love R51.
DNA is so awesome
Looks like R-51 made a pretty shocking discovery
Its enjoyable to watch these and helps get my mind moving and thinking about how to make the world a better place.
I love this show!!!!!
I liked the part about how WD-40 was invented.
I love this program
This was the best science live yet I learned so much!
I love how much I learn from these!
Is it just me, or should we keep R51 away from Dr. Roger Billing’s things from now on?
Me and my sister love watching science live.
This inspires me to keep trying and never give up!
Merry Christmas Acellus!!!
Science is so cool!!!
WD-40 and the DNA info was really interesting. Thank you!
I graduate in 2026 and so excited about this new change! Thank you!
Science live is the best
Dr. Billings is a genius.
I like to make circuits and relays with one of my science kits!
Dr. billings is so smart can’t believe NASA used the WD40
Science is so cool – thank you for teaching me!
Thank you Mr.Billings! Great video.
Really liked this weeks episode. Can’t wait till next week.
It’s amazing that they didn’t give up after failing more than 30 times, hopefully there are more people like them!
Science live is so cool🌸 *
It was really cool to watch Dr Billings show us about the radio waves and electricity!
R51 is sooo hilarious!🤣
I use WD 40 on my bike and it works amazing.
But i didn’t know that that’s why its name it WD 40.
WD40 is insane! i loved this video thank you guys for all the work you put into this!
R 51 got shocked!😆😄
I just love watching this because Im going to be a scientist one day.
Dr billing I just started and I am loving it
I really enjoyed learning about how scientists now are trying to use DNA for storage! I always struggle with the storage on my phone and I thought this subject was especially cool. Thank you!
Thank you Dr.Billings!!
WD-40 is cool!
Thanks alot, Dr. Billing! Amazing!
Awesome! Its so cool to learn about WD40!! And what happened to R-51 was SHOCKING!
My Dad uses WD-40 on everything!
The relay that Dr. Billings made reminds me of a smoke detector that I made for a Science Fair project.
I didn’t know a WD40 had that many uses! Definitely going to try it, especially on my Lego sets!
Roger Billings makes Acellus Science Live so engaging; his passion for science is contagious!
Science is so cool and interesting.
i really liked learning about WD40 cant wait to talk about it with my mom
Dr Billings is now one of my favorite people in Science Live!
Science Live is always so fun!
This is very interesting, thank you Dr Billings.
A singular living human cell has 3.2 gigabytes of data stored in it? Very interesting!
Acellus is great, and I realize that more each week!
R51 is the best! 40 try’s to make wd40 is crazy.
I love watching science live it makes my day so much more better!!
Mr. R51 is cool!!!!!!
Thank you for this video Mr. Billings
Dr. Billings is my favorite, great video.
I didn’t know WD40 did that many things.
My dad always has a can of WD-40 around the house. I thought Tobias did a good job of explaining where WD-40 came from and what it was originally used for.
Excited to share what I learned about WD40 with my Mom and Dad!
I love Science Live. Always looking forward to it every week.
Gotta love little r 😂😂😂😂
Dr. Billings is the best! And he is SO smart! I love this science class, and I also love learning from here!
Wow…2000 uses for WD-40!
i love r 51 i love 💓
Thank you for Science Live!!!
I like how they talked about DNA.
Science Live is great!
I love SCIENCE LIVE, it the best!
The story about WD-40 is so interesting! Definitely an encouragement to keep trying even if at first you don’t succeed!
It was interesting to learn about WD40 and all of the uses that it has! I also loved to learn about how Dr. Billings invented new ways to make radio waves.
Thank you Dr. Billings for the fascinating lesson!
I love the idea of storing information in DNA! We are getting so futuristic!
Thank you Dr. Billings for the fascinating lesson!
DNA is incredible
My mind was blown hearing about how WD-40 got it’s name! My Dad has some of this in the garage!
SCIENCE is the best!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
I loved r-51 today and I did not know it took 40 try’s to make WD40♥️
Thank you !!Dr Billings
I did not know that there was such thing as Acellus world 🌎.
R-51 was really funny today!
Love science live!!!!!!!!
My grandma uses WD-40 for everything.
Thank you Dr.Billings! Loved this episode .
Fascinating topics today!
Thanks for the DNA & data facts and information. I enjoyed learning about the WD-40 also, considering that it is something used frequently.
Is R-51 OK?! That looked like it hurt!!
These last few projects have been very fun to watch.
Dr.Bilings is so smart I love watching science live.
Please keep R-51 forever, he never fails to make me laugh.
Dr. Pajet Monet looks so cute today!
thanks DR .B
Science live is awesome!
Science is seriously magic! So cool!
Science live is the best.
We have WD40 in our house, but I never knew it had so many uses! Thank you Science Live
Tobias should totally make a course! Tuning in from Demotte, Indiana
That was absoultely cool Dr. Billings
Poor R51!
EVEN MORE Interesting facts from science live. It is the best and I really enjoy learning all this information!
The WD40 thing was pretty cool. It acts as a degreaser so that makes sense. Great tip to share for sure.
Haha I love R-51!
R 51 being mischievous as always! And he finally got a lil karma back. Lol
I love Tobias’s section.
I’m always learning something new from Dr. Billings and am thankful I have enrolled in this program.
I think the answer to Tobias’ question about how many times you should try something is at least a million. You should never give up.
The story about how WD40 was created is very interesting
Wow!! WD-40 is super cool. I will get my parents to show me how to use it!
The ACELLUS WORLD event looks fun. We want to try to make it sometime.
I loved this science video today and had no idea it took so long to make WD40 so that was very cool to learn.
Dr Billing’s rules
i laughed at organic grounding! I need to tell my dad about wd40. he uses it for everything.
R51 experiments are funny!
Watching from South Dakota!
Really interesting learning how WD40 was made!
Thank you Mr. Billings!
I can’t believe you can use WD 40 for all those things! I also can’t believe how small the coil was in the relay.
Another cool presentation! I learned plenty of interesting facts from it!
So cool, Dr. B! Who knew…WD40!
The WD40 is clever, thank you for showing us!
Great Show. Thank you Dr. Billings.
R51s part is still definitely my favorite!
wow that was amazing great show. I never knew that about WD-40
No r51 got shocked!🤣🤣😂😂
This was a great and amazing video and it was cool to learn that it took 40 tries to make WD40
I’ve been wating a week for this so excited!
I really enjoyed this episode!
I love science live I learn so much I can’t believe how WD 40 was made.
Science live is awesome.
Hi from Illinois that was very interesting about WD-40 I wonder if my family knows this fact! This was a great video thank you:)
Science lives never fail to impress me!
You really do learn some very interesting facts that you would never think to ask on science live.
I’d love to come out for Acellus World!
I actually never knew that regarding the WD-40… you learn something every day.
I cant wait to learn about how a vacuum works, as well as more about morse code!
So that is where the 40 comes from in WD40.
what are radio waves used for are they used for wireless stuff
Cool! This was great, Dr. Billings is the smartest 🙂
The story about WD 40 is so cool!
Dr. Billings, how would the radio signals transmit over extremely long distances, like across the sea or in outer space without being disbursed?
Dr. Tobias, that is a really cool story about WD-40! I can’t wait to tell my parents tonight. They use it all the time.
Dr. John, do you think that type of memory storage will become common enough that people could afford it?
WOW 40 try`s to make WD 40 is crazy thank you for the information”SORRY IF I SPELLED INFO WRONG”😁
love from “Rhode Island”🥰
I love Science Live. It’s so interesting how WD40 is made and how NASA uses it
thank you acellus
That was a shocking surprise for R-51
This was great I didn’t know that it took 40 try’s to make WD40
I liked learning about WD-40.
Tobias is my favorite!
This is sooooo cool!!! Thanks Dr.Billings!!!!!!
Dr. Tobias, have scientists ever tried to figure out what is in WD-40?