What Makes Turn Signals Work? (Inside a Thermal Flasher Relay) • Cars Simplified
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- เผยแพร่เมื่อ 15 ธ.ค. 2020
- Thermal flashers are an early method of making turn signal lights turn on and off. Inside the flasher relay is a bimetallic component with a strip element that heats up, expands just enough to push on the metal it's attached to, connects the circuit, and allows electricity to pass more freely another way while the strip cools down. When it cools down enough, it snaps back into its original position, starting the process over again.
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It's a good design because the fast blinking lets you know you have a bulb out.
so that's where the ticking sound comes from. what an ingenious design. never know it was fully non digital.
Wow, thank you. This was explained extremely well
Regarding the part when you say that the more amps you have the quicker the blinker will operate... I don't know about that but quicker blinking can be seen also when you have a faulty incandescent bulb as well no matter that the current in the circuit becomes smaller than the one that flows through the circuit with all bulbs available. Less current causes shorter movement of the strip but still enough to contact the output terminal
@DanovDaniel You are correct! When one bulb burns out or is removed, there is only one bulb left, and the resistance of this bulb is greater than both bulbs in parallel. The higher resistance causes less current flow, so the bi-metallic strips don't heat up as much therefore they take less time to cool down. When it takes less time to complete the cycle of opening and closing the contacts, the bulb blinks faster.
Well explained, the parts i understood anyway, all & all, i get how this type flasher relay works...Thanks!
Too bad some people don't believe in using turn signals! Those lazy and careless drivers!
Tnx! Nice video
Nice, thank you
Can we use flasher output for microcontroller?
Excellent....
Can any 3 pin 20 amp flash relay be replaced with another same 3 pin 20 amp?
great video thx, fyi at 4:00 you say I have a video here and no link
Thanks, and I appreciate you pointing that out! I must have missed that on upload day. Partially fixed that just now!
the explanation is good, but it doesn't explain why when a bulb is blown the flash rate actually increases :)
You need to watch his next video on series and parallel I imagine it’s explained there. Total Resistance in a series circuit is r1+r2 (resistance of globes). Resistance in parallel circuit is 1/r1+1/r2. The resistance of the single bulb is greater than 2 bulbs wired in parallel. So when 1 is removed (blown) you’re left with 1 globe wired in series resulting in more resistance and more heat in flasher relay, therefore you get faster cycles of the flasher relay.
@@Dodgepete59 No, that is not what happens. You got most of it right though. When one bulb burns out or is removed, there is only one bulb left, and the resistance of this bulb is greater than both bulbs in parallel. The higher resistance causes less current flow, so the bi-metallic strips don't heat up as much therefore they take less time to cool down. When it takes less time to complete the cycle of opening and closing the contacts, the bulb blinks faster.
@@bernardocisneros4402 that makes more sense, thank you for clarifying.
Can anybody give me the proper term for "it" "this" "them"?
My flasher relay works fine when directly connected to battery. But when i put it in the socket, the flasher just turned on not blinking. Can somebody help me to understand this 🥺
The flasher you have is solid state, and polarity sensitive, so your light bulb will be constantly lit, if you don't pay attention to polarity. You have to reverse the wires. That's what's nice about thermal flashers. They're not polarity sensitve. You can stick them in any which way.