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 »
Hi this is Nicholas from Hollywood, Florida so excited
Hello from Illinois! :3
Hi from california! happy for todays live
hello from Texas! 🙂
Watching from Alabama.
Hi from Montana! Excited for Science Live this week!
How’s every body’s night going? Can’t wait for to nights live!!!!!! :] :]
Amazing! how about you
Can’t wait for this episode! 😀
How much data do we have
I love Science Live!!
I love science.
Hi from Nevada!
I hope Billings says hydrogen at least 12 times
Hello from West Virgina
Hello from Texas!
Hello all
hello from new jersey!!
Hi from kingsport tn
Hello from Texas
cant wait!!
Hello from Illinois!
hello my name is Emrie i love acellus and science live its intresting and funnny WE LOVE SCIENCE LIVE! thankyou for helping students learn science its awsome!
Ready for the live !!!!!
Hello, from Oregon
Hi
hello from missori
Hi, from the great state of Texas!
Hello from Texas!
Looking forward to Science Live!
i love science.
Hello from Aledo IL!
Hi from Georgia I’m extatic for science live
Here from Indiana
Hi Noel from Florida!!
Hello from New Hampshire!
Greetings from Delaware!
cant wait
Hello, ready for science live…
hey hey hey! kid from TX!
hello from New york
Hello from Tennessee
Hello
hi
Hi
Hello from oklahoma
Hello From Spokane, Valley 🙂 🙂 🙂 🙂 🙂 🙂 🙂
i love science
soooo ready!!!
Hello from Kentucky!
Can’t wait for this weeks science live!
Howdy from the great Lone Star state Texas. 🙂
Hi from NJ
I love this live
Hi! I cant wait for the live today! have a great day!!
Hey guys!
Heyyy I’m from Texas and I love SCIENCE LIVEE!!!
I am excited.
I wonder what we may learn in today’s live.
Hello from Texas!
Hi from Georgia!
I love watching these they’re fun to watch
So excited for todays live
Hi cant wait for todays lesson
howdy
Hello
From NC tuning in and happy to be here 🙂
Hello and good morning from Japan!!
Hello from Las Vegas! Excited for todays class!!! =)
Hello Science Live! Jace from FL!
I liked the part about the battery.
Hello Everyone. Representing Louisiana. Ready for another great science live tonight
Hello! Glad to be here
hello from nevada
Hi from VA
here
science live is a great
Hello!
Hi from Ruskin, Florida
Hello from Utah !
hello from tennessee
Hello from Indiana
Hi from TX
hello from OH 🙂
Hello! How are y’all today??
hey everyone lets do this
i live in california
love it
hi from texas
Hello from Woodville, Texas!! Can’t wait to learn something new!!
Cant wait to see what todays subject is!
Can’t wait for the live!
Hello from ga
hi
I love to watch these lives
Here from Georgia
Hope this is an amazing live!! So excited 🙂
Helloo from TX! Came to this live early 🙂
Hello from Florida
Can’t wait for the live!!!
hello from the big o
hi from nd
Can’t wait to watch today’s live!
So ready for this week’s Science Live!
Hello from Virginia.
Comment HEYYY FROM GEROGIAAAA😝
Afternoon live my name is John and I live in NC Im very happy
Sonic live especially when they do the EXP
Hi from texas!!
Hi from ct!
I can not wait for tonight’s live. This is my favorite part of the week.
here from columbus
Hello form North Carolina!
hi I can’t wait for this
hi
hello from montana
I am hoping to take that new class soon!!
Hi from Alaska!
hi from massachusetts
Hi from Tennessee super excited for tonight’s live!
Hello from Illinois
Hi from GA!
I so excited for the science live.
Hello from michigan
HI From Texas CANT WAIT
I wonder what we are doing today
Hello from NC! can’t wait for todays live.
Hello from Texas
hi from virginia
Hi!
Excited for today !!
Hi everyone I’m happy to be here
hiii
goooooood morning!!!
Hello from Texas
Hi from North Carolina
Hi! From Panama
hi from Michigan
Hello from CT! Excited for the live tonight, feeling good.
hello from Arkansas.
Good evening from Illinois!
hey
Hi! Can’t wait for the live tonight
Hello from boca
Excited for today’s discussions as always
So excited for tonight’s science live!!!
Im exicited for science live
Hello from Nebraska!!!
Hello from ny!exited for today’s liv!
Hi I can’t wait for this live today!
hi from tx
Heeeyyyy from georgia
Hello
hello from mississippi
while i wait for this video to start i hope you have a nice day or night
Hello from Richmond, VA
Hello from the lost city of Atlantis 100% ;_;
hey from new hampshire
Hello from Kentucky
SO COOL!!!
Time for Science Live!
Heyy
thanks for good information
hiii from Illinois
Hi! How are you?
Hi from Nebraska.
Hello from OHIO
Hello from Williston ND
hello
HI, from North Carolina!
Hey from California! Im excited for todays episode😁
Hello I can’t wait for today’s live!!
Hello from Madison
Hello from Colorado
Hiiii From Buffalo
I’m so exited for sciene live
Im so happy to be here
Hey
Checking in from TN! Hi!
Hello from DFW
hello from California