Prática de Shadowing: The Difference Between Contactors And Relays - ELECTROMAGNETIC SWITCHES electricians use - Aprenda a falar inglês com vídeo

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What's going on my friends?

This is Dustin Stelzer with Electrician U and today we're going to talk about the difference between a relay and a contactor. so relays

and contactors are pretty much the same thing i mean they

essentially work the same way both of them are electromagnetic switches

so rather than you having to come up

and push to turn this device on you know like manually

you can actually send current to it send an electrical signal

and that is what turns the thing on it does

that for both of these both of them are electromagnetic switches

both of them are really used as like multi -pole switches

so if you want to control several different circuits

or several different loads that are on different circuits at the same time you can do

that with both of these whereas a normal light switch you

can only control one thing both of them have coils

so there's actually a coil of wire in here that

when you send current through it engages an electromagnet

and it sucks the contacts shut or opens them up they both operate

that way and both of them have contacts

so they have multiple different contacts

that you can run say home runs from a panel to

and then you run out of the other contacts out to

the field somewhere to different kinds of things relays also have them so even though

that they're very similar in a lot of ways they're very

different in some important ways typically a relay is going to be a low voltage

or low current application meaning that the both the coil

and the contacts really can't handle a lot of current a lot of these things are rated at like 5 amps,

10 amps, 15 amps, where contactors are typically used in higher voltage, higher current environments.

The contacts on these can handle anywhere from 30, 40, 50 amps.

The metal and the pieces that make up the inside of this relay are actually a lot smaller and more compact,

whereas a contactor, everything is a lot more beefy.

Typically with relays, you cannot change the coils inside of them.

Whatever rating you get this device is the rating you got to run to it and through it.

Whereas a lot of contactors, not all of them, but a lot of them, you can actually take this coil pack out and put a brand new coil in it.

So if you have 120 volt coil but you need a 277 coil, a lot of times you can just go to the supply house, pull this out, put a new one in.

Another difference is that relays can typically only control up to like two

or three loads they're just designed for a couple of different

functions whereas contactors this one specifically can do four loads

and there's some even like this crazy one back here that's a six pole

and it can even be expanded to do eight

or this guy up here can do 12

so they're a lot more expansive most relays also have a both a normally open

and a normally closed option so you can kind of turn some things off

while turning other things on at the same time with a relay where most general use contactors you can't do

that general use contactors are typically only normally open or normally closed

so everything is going to turn on or everything is going to turn off

when you energize that coil however lighting contactors like again this guy

or this guy you can change you can add auxiliaries to them you can kind of move back and forth

whether or not some of them are normally open

and some of them are normally closed

so they have a little bit more high functionality

but again it's kind of the same thing it's just limited to usually two

or three things or anywhere from like two to twelve in

that case another thing

that some contactors have again lighting contactors more specifically is they have the ability to be mechanically held

so you can latch them in place and that way

if power is gone

or you lose power to the coil all the lights fail in an on position where relays don't have

that function basically once you send power to them

and you take power away they turn on or they turn off like a general purpose contactor would.

So that's pretty much it for the differences between contactors and relays.

I hope that kind of cleared some things up.

A lot of people when they hear relay they're like uh what is that it's some like magical switch.

No it's the same thing.

They're both just electromagnetic switches.

You send power to them to turn them on and off

and that's as as difficult as it gets

so i'm going to have a video that's going to come out uh specifically on relays

that just talks about how all relays work

and i'm going to cover a bunch of different types i'm going to have another video

that just covers contactors how they work i'm going to tear them open

so you can see the insides of them talk about different environments in which you use them

and then i'm also going to do a video on both

of these where i'm going to wire each one of them

and draw some diagrams and show you how they work

and how the practical application of both of these works out

so in the next couple of months you're going to see a few different videos on contactors

and relays so thank you guys so much i really appreciate your attention

and i will see you in the next episode

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Vocabulário e dicas de fala para esta lição

Esta aula de conversação usa o vídeo “The Difference Between Contactors And Relays - ELECTROMAGNETIC SWITCHES electricians use”. As palavras que mais se repetem: contactor, relay, coil, normally, contact. Este vídeo tem 6 frases e 952 palavras para praticar shadowing. A fala dura 5:17. O falante fala rápido, cerca de 180 palavras por minuto, então espere sons ligados e reduzidos. 84% das palavras estão entre as 3.000 mais comuns do inglês; vale a pena estudar o restante antes de começar.

Vocabulário principal deste vídeo

15 palavras do vídeo que vale a pena aprender, com pronúncia e significado:

Palavra	Pronúncia	Significado
coil substantivo	/kɔɪl/	espiral
whereas	/(h)wɛɹˈæz/	enquanto, ao passo que
rat substantivo	/ɹæt/	ratazana, rato
electromagnetic adjetivo	/ɪˌlɛk.tɹoʊ.mæɡˈnɛ.tɪk/	eletromagnético
circuit substantivo	/ˈsɝ.kɪt/	circuito, volta
wire substantivo	/ˈwaɪɚ/	arame
voltage substantivo	/ˈvəʊltɪd͡ʒ/	tensão, voltagem
practical adjetivo	/ˈpɹæk.tɪ.kəl/	prático
essentially advérbio	/ɪˈsɛnʃəli/	em essência, essencialmente
suck verbo	/sʌk/	chupar, sugar
tear verbo	/tɛɹ/	rasgar
pole substantivo	/pəʊl/	polo
magical adjetivo	/ˈmæd͡ʒ.ɪ.kəl/	mágico
compact adjetivo	/kəmˈpækt/	compacto
diagram substantivo	/ˈdaɪ.ə.ɡɹæm/	diagrama

Phrasal verbs que você vai ouvir

Palavra	Pronúncia	Significado
turn off verbo		desligar, apagar
come out verbo	/ˌkʌm ˈaʊt/	sair, partir
make up verbo	/ˌmeɪk ˈʌp/	compensar
work out verbo	/ˌwɝk ˈaʊt/	calcular

Pronúncia para ficar de olho

O falante usa 23 contrações e formas reduzidas, como gonna, I'm, they're. Diga-as na forma curta, do jeito que você ouve.

Palavras longas — acerte a sílaba tônica: electromagnetic /ɪˌlɛk.tɹoʊ.mæɡˈnɛ.tɪk/, electrical /ɪˈlɛktɹɪkəl/, essentially /ɪˈsɛnʃəli/, auxiliary /ɔɡˈzɪl.(jə).ɹi/, manually /ˈmænj(u)əliː/

Sons difíceis para falantes de português:

Consoante final — sem acrescentar um “i” depois: amp /ˈæmp/, rat /ɹæt/, electromagnetic /ɪˌlɛk.tɹoʊ.mæɡˈnɛ.tɪk/, circuit /ˈsɝ.kɪt/, suck /sʌk/
/l/ final — a língua toca o céu da boca, não vira “u”: coil /kɔɪl/, practical /ˈpɹæk.tɪ.kəl/, electrical /ɪˈlɛktɹɪkəl/, pole /pəʊl/, magical /ˈmæd͡ʒ.ɪ.kəl/

Como praticar com este vídeo

Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
Comece na velocidade 0,75×, faça shadowing frase por frase e volte à velocidade normal quando ficar fácil.
Grave a sua voz e compare com o original, prestando atenção a palavras como coil, whereas, rat.

O que é a Técnica de Shadowing?

Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.

Técnica de shadowing: leia o guia completo passo a passo →

Prática de Shadowing: The Difference Between Contactors And Relays - ELECTROMAGNETIC SWITCHES electricians use - Aprenda a falar inglês com vídeo

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