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 »
I love watching sicence live!
Did you know that male seahorses give birth instead of the females?
I love R51 he’s hilarious
I love the technology spotlight, everything that is covered in that segment is so interesting.
every episode is a new beginning to learning something new
R-51 singing jingle bells had me laughing so hard.
Why won’t they tell us what’s in WD 40? I don’t think anyone will be making their own of the wd 40.
cool lesson on trying again
hi from Georgia
Watching from Charlotte!!
r51 was funny.
Science live is the best
First time here.
This is amazing stuff to learn!!
This was a great learning experience.
grateful for these science lives!
Thankful for this opportunity!
My dad uses WD40 for anything and everything haha!
wow that is so cool how they kept trying and it figured out
I always learn so much from science live!
Thank you for the video
Can you meet Mark Rogers at Acellus World?
WD40. the best of the best. lol
Why do they give chemicals such long names if they are just going to change it anyway
this is awesome WD40 is too
merry christmas to science live and all the teachers!
How can someone who has an idea but no materials to create it invent their idea?
Hi from va
these are always so interesting to watch
I thought WD-40 was just a random household product that had no use lol.
Excellent video! Can’t wait for next week!
I really liked the story about the start of WD40.
Can’t wait to be amazed by what we learn next!!!
This program is so entertaining.
Thank you kindly for always giving us a fun and exciting learning experience.
So how do you keep the data “clean” for that long?
We know that DNA controls information in living things. It was interesting to learn that DNA storage data like in the Atlas Eon 100 project. I wonder how DNA storage will evolve?
I might build one.
I thought it was crazy that a living cell can hold 3.2 gigabytes of data. I want to learn more about how they use things in the human body to make things outside the body. Like using a living cell to learn how to make data storage last longer!
Storing data as DNA seems expensive
Science live is my favorite!
I love learning from science live!!!!
I love these episodes!you should do more like these.
This was a great video, no questions.
Thomas Edison once said that the most certain way to succeed is to try one more time. There was a company that was trying to make a liquid for NASA to keep water off of the steel of a rocket. It took them 40 tries and it finally worked. It is now called WD40 and has 2000 certified things you can use it for.
I love how science live keeps me very well entertained!
i had no idea NASA uses WD40 huh the more you know!
how hot is the sun
thank you for explaining how to invent something so well. It’s hard for me to understand but I love it.
R51 is a conductor was so
Funny but wd40 is the answer to everything
love learning new things and this is best way to do it!
I love R51 and I thought it was cool that it took 40 trys to make WD40
I love the WD 40 story, so much fun learning about DNA
Hopefully R51 is okay!
The lesson was super interesting!
I love these science videos!!!!!
Ive always been curious about DNA thank you for sharing some knowledge about it
I never knew there was so many uses for WE-40, it was fascinating to hear about why it was made.
Hope your staying warm Merry Christmas
What are some bad signs of a relay switch?
Keep up Science Live, amazing program!
Dr. Joshua said the last graduating Acellus Academy class was so big that they had to have 11 different commencement ceremonies. What is the average amount of ceremonies each year?
Acellus is the best and you can learn so much
So funny 😂
#I love science live
I’m sick with the flu, but I still enjoyed this week’s video.
Science video was good
Science live is the best i always cannot wait until Wednesdays to watch it and learn, it give me so much information.
so happy for these amazing videos
acellus is the best
Thank you Dr. Billings!
I love learning the history on morse code. It’s very interesting and always has exiting facts. My question is simple. Is it possible to use hydrogen to create electric waves?
I knew about Nasa’s use of WD40 from my family, though I didnt know all the details shared here.
Was a good video this week❤
the fair looks like a lot of fun!
How big is the spark?
It’s cool to know how WD-40 got is name and that it was actually invented for rockets.
I liked how they are able to see planets that are really far away and also see the helium clouds with the telescope! It won’t be long before we spot aliens!
Science live is awesome!!!
Merry Christmas R51!
Thank you! It was a very interesting episode!
i love this show
I never would’ve guessed WD40 was made for rockets.
This is the first time of hearing about WD 40’s, it’s very interesting.
Hi from Hixson tn hope your staying warm
Thank you for these weekly lives. I learn so much
That is true, I never have enough space on my devices.
My computer broke and I had to buy a new one because my old tablet didn’t support the app.
lets gooo Roger B!!!
Science is very intresting.
Really excited~
Is there a way to message other students my age on Acellus? kind of like a pen pal.
i like the part about electricity
This is the first Science LIVE I’ve watched and it’s pretty informative. Space is a pretty neat thing
i enjoy learning new things each week
I like how the video talks about DNA have to match and if dorting together.
wd-40 is so facinating.
The part about WD-40 was very cool, and I didn’t know that was how an electric bell worked.
I find it very interesting how WD-40 was originally developed for the aerospace industry, and now it’s a common household item.
I actually did know that about WD40, my brother is a mechanic and builder. He works with tools and has skills that he passes down to me when he can or when i need help
I never new WD-40 came from an experiment to help NASA.
I love watching live science live, thanks you so much
Science live is great
This is another extremely interesting science live video. I can not wait for the next one!
this was very interesting especially the WD40 part, thank you.
So funny how NASA uses WD40!
YOOO that is so cool like what a great invention XD40
I want to be able to come to the graduation. This is my first time at Acellus.
WD-40!!!!!!!!!!!
Great science live guys! It was the light of my day LOL!
I always wondered why iron turned colors over time. This was a cool video about the rocket materials.
wow this week was so cool and interesting
DNA is so cool. It makes me think of how amazing God is!
WD-40 is cool.
So much interesting stuff tonight!!
I like that NASA uses WD40
Now I know why it’s called WD-40 and! Such a good invention.
I love science live so much!
R51 never disappoints!
I think the best part about science live is that we get to learn new things every Wednesday!
This was really fun to watch
I love science live I always learn so many new cool things like when a telephone was made
Thank you for the opportunity to learn about all of this. My mom is always using WD40 for different things.
I love watching Science Live every week!!
Rockets are so cool. I love science!
𝕀 𝕝𝕠𝕧𝕖 𝕝𝕖𝕒𝕣𝕟𝕚𝕟𝕘 𝕒𝕓𝕠𝕦𝕥 𝕔𝕚𝕣𝕔𝕦𝕥𝕤!
Hello from North Carolina!!
Wow, I wonder if NASA still uses WD-40 on their rockets, how interesting! Thank you!
Acellus World looks fun! Also, WD40 is an interesting product.
I loved this week’s science live.
I love learning new things from Science Live
I really like learning about rockets.
Hello from Tennessee
What is the relay?
Science is so interesting. So many things you can use in so many ways.
how does the little rotating/spinning thing behind Dr. Billings keep moving the whole time he is talking?
Science live is so interesting
It was interesting to learn about how bells were invented!
I want to work for NASA one day!
These episodes are so fun to watch!!
Why is making mistakes important in science?
That is amazing I never knew I could learn so much
Science live is always awesome!
My Dad uses WD40 to work on his jeep!!!
I did not know it took 40 tries to create WD40!
This videos was very interesting. Thank you guys for making these videos!
i like the radio waves and the morce code in the transmiter that it was alot of things that made for the morce code.
love these science videos!!!!
Loved todays science live! Can’t wait for next weeks!
I love learning with science live
I love learning with science live
I had no idea that wd40 was invented for rockets
I love watching science live! It is the best thing to watch
r 51 is so funny
I love watching science live! It is the best thing to watch!
I would really love to try some of the experiments l’ve seen
I love science live so much!
This company Acellus is five stars !
I really like Dr.Joseph and I never knew that they tried 40 times .Thank you for Acellus!
Hello! Kai from South Dakota, great video!
My dad also uses WD40. Very funny
Great Science Live, NASA, and WD40, learn something new every Wednesday.
i didn’t know NASA used WD40
This relay is really interesting
Science live is the best!
That was great! Very interesting science. My dad has a can of WD40 in his truck, and he uses it from time to time so I know what it is. I enjoyed seeing the clips from Acellus World with Todd Edmond.
I love Acellus and watching the videos!
so grateful for science live
so thankful for science live teaching me new things!
It was neat to learn how WD40 got started. In 1953 Rocket Chemical Company created a formula to coat rockets to keep water off the steel. After 40 tries they got it perfect. In 1993 they were selling 1 million cases a week. There are many different ways to use WD40 today.
my favorite part was about DNA and data
Science Live is so cool!
I love learning with science live!
This helped me understand how simple electrical components are used in everyday machines.
This was so fun to listen to!!
My mom uses wd40 to fix my bike sometimes