Shadowing Practice: Basic Ohm's Law For Electricians - Learn English Speaking with Video

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So you need to learn Ohm's Law, but you're lost or have no idea where to start.

Don't panic, you've come to the right place.

In this video, we're going to simplify Ohm's Law for electricians.

Look at a demonstration and finally put the tires to the pavement and do some real calculations using what we've learned.

We'll cover series, parallel, and combination circuits in future installments.

Hey, my name is Dustin.

I'm a licensed master electrician.

I'm also a test prep and apprenticeship instructor.

Welcome to this episode of Smarter Sparky.

So what exactly is Ohm's Law?

To answer that question we have to acknowledge a problem with electricity.

We can't see it, we can't hear it, smell it, taste it or feel it.

Sure we can see lightning, we can hear thunder, and we can get zapped by electricity, right?

But those are all the observable effects from electricity, not the electricity itself.

So the problem with electricity is that it's very difficult to observe, but we can measure it.

The things that we can measure are voltage, current, and resistance.

These are the key players in the battle that is Ohm's law.

Let's take a look at the lineup.

Voltage is kind of like pressure.

Think of low pressure like low voltage and high pressure like high voltage.

It's how much force or more technically electromotive force, which is the technical definition of voltage, is available.

Voltage is symbolized by the letter E.

I know that's kind of weird.

Why isn't it the letter V, right?

It's because we use the letter V as our units, volts.

So that leaves us needing a different letter to symbolize the unknown value.

Therefore we use the letter E from electromotive force.

So for example E equals 12 volts.

Current is similar to flow rate or gallons per hour.

A garden hose is a relatively low gallons per minute so we could think of that as low current.

Whereas a river is moving lots of gallons per minute it would be thought of as a higher current.

Current is symbolized by the letter I for similar reasons as voltage right we need that different letter.

Current is measured in amperes or amps

so we use the letter A for the units

and symbolize it with the letter I which stands for intensity so for example I equals 4 amps.

Resistance is the final contender which can be thought of as a restriction in a water line.

The harder you squeeze a hose, the more the flow is restricted.

Resistance is measured in ohms.

It's symbolized by the letter R, which stands for resistance, and the value is symbolized by the uppercase omega symbol.

For example, R equals 8 ohms.

Resistance is all around us.

All wires have a natural resistance to them.

Bad connections act like a resistance, and we have to treat them as such.

We even have a component called a resistor that is an on-purpose resistance that can be added to a circuit.

Ohm's law is what relates all three of these items together.

Ohm's law states that voltage is equal to current times resistance.

This gives us the first formula, E equals I times R.

We can rearrange this formula and derive two additional formulas giving us a total of three Ohm's law formulas.

Here's the deal.

We don't have to memorize all three.

We can just remember the first one, E equals I times R.

By filling in this triangle, we can cover up the value that we want to solve for and get the resulting formula.

For example, we can cover up E, which leaves it next to IR.

When the leftover values are next to each other, that signifies multiplication.

So E equals I times R, the formula that we started with.

If we want to solve for current, we can simply cover up I, which leaves E over R.

That gives us I equals E divided by R, the second of our formulas.

Finally, we can solve for resistance by covering up R, which leaves E over I.

That gives us R equals E divided by I.

This trick is great for remembering Ohm's Law as you only need to memorize one formula.

You can simplify the triangle just by drawing a T bracket and filling in the values.

That's exactly what I did when I sat down to take my state exam.

Draw the little letter T and fill those values in.

then you've got that Ohm's law formula right there on your scratch paper.

I'm sure you guys have all seen this little cartoon before, something very similar.

It's a great graphical representation of how Ohm's law works.

Voltage or pressure is trying to push current or amps through a wire, pipe, but resistance is restricting how much can actually move.

Let's visualize this concept using the water pipe analogy we've been using.

Here we've got an aquarium pump and a length of tubing.

This hose clamp is going to act as our resistance.

With the clamp fully open and the pump running, we have our maximum current flow.

As the clamp is tightened down, increasing resistance, we can see the current flow decreases.

We get less water or current making it through the pipe.

Let's do a few practical Ohm's Law calculations, one for each of the three Ohm's Law equations.

Consider this circuit.

How much current would flow if we had a resistance of 6 ohms and a voltage of 12 volts?

So it looks like we need to solve for I which is our placeholder for current.

So let's grab our triangle and cover up the letter I and that leaves us with E over R, meaning I equals E divided by R.

Now it's just a matter of plugging the values in.

I equals 12 volts divided by 6 ohms.

12 divided by 6 is 2 amps.

See?

Easy peasy.

What about this circuit?

Now we know the voltage and current, but we don't know the resistance.

Let's grab our triangle and cover up the letter R.

That leaves us with E over I, meaning R equals E divided by I.

Simply plug our values from the diagram into the formula, which gives us R equals 24 volts divided by 6 amps, and we get a resistance of 4 ohms.

Finally, we have this example.

Now we know the current and the resistance, but we don't know what the applied voltage is.

Grabbing our triangle, we can cover up the letter E.

Remember E is voltage which gives us I right next to R meaning E equals I times R.

Plugging in our values we get E equals 5 amps times 8 ohms

and that calculates out to E our voltage equaling 40 volts.

Hey real quick getting noticed by the YouTube algorithm is nearly impossible these days without help from viewers like you.

If you like this teaching style and find this video helpful, please take a second to like and drop a comment.

It lets the algorithmic overlords know this content's worth sharing.

All right, back to the good stuff.

We've just talked about the three items that can be measured for Ohm's Law, voltage, current, and resistance.

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There's actually a fourth item as well, and that's power.

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Power is a unit of energy.

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We symbolize it using the letter P, and it's measured in watts.

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We use W as the units, watts.

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Basically power is the rate at which electrical work is performed.

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For example, a 60 watt light bulb does less work than a 100 watt light bulb.

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It puts out less light, less heat.

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The 100 watt light bulb puts out more light and more heat.

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There is another formula that concerns Watts law.

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Watts law states that power equals current times voltage or amps times volts.

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This formula is easy to remember because the variables spell out pi.

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Check it out.

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P equals I times E.

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Everybody likes pi, so it's easy to remember.

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Let's grab one of our previous examples.

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We calculated this first example to find out that the current was 2 amps.

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We can further calculate the power of this circuit by taking the current and multiplying it by the voltage.

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So the wattage of the load is going to be P equals 2 amps times 12 volts, or 24 watts.

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Just like Ohm's law, Watt's law has three different arrangements for the same formula.

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And just like Ohm's law, Watt's law can be put into a triangle to help us remember all of these formulas.

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Just remember pi and use that to fill in the triangle.

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Maybe you've seen a wheel like this before.

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Whether you have or not, it certainly looks intimidating.

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This wheel is called Ohm's wheel or Watt's wheel and it's actually pretty simple.

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The way the wheel works is we have four quadrants.

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Each quadrant calculates out one of the four items we can calculate.

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Voltage, current, resistance, and power.

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Each of the quadrants has three formulas within it.

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So taking E, voltage for example, E equals I times R, E equals P divided by I,

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and E also equals the square root of P times R.

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And it works that way for the other quadrants as well.

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Pretty neat, huh?

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This wheel actually has Ohm's law built within it.

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Here's E equals I times R, like we just saw.

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Here's I equals E divided by R, and here's R equals E divided by I.

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Watt's law is also in there.

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Here's pi, P equals I times E, and here's the other two formulas as well.

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Here's I equals P divided by E, and E equals P divided by I.

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So that leaves us with six remaining formulas.

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Where do those come from?

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These are derived formulas.

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Basically, they're an algebraic mashup of both Ohm's law and Watt's law.

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I'll show you one real quick example of where they come from, but don't worry about knowing this.

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It's only for the curious.

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For our example, let's take this formula here.

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E equals the square root of p times r.

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It's derived by taking the two formulas, i equals p divided by e, and i equals e divided by r.

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i is equal to i, therefore p divided by e has to be equal to e divided by r.

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If we cross multiply, we get e squared equals p times r.

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Take the square root of both sides to undo the square on the e, and we get e equals the square root of p times r.

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All the other formulas are calculated using the same algebraic concept.

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It combines Ohm's law and Watt's law to eliminate one of the variables.

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Make sure to watch the upcoming Ohm's law videos on series, parallel, and combination circuits,

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and I'm going to show you a way to solve them without actually really even needing these derived formulas.

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Links will be down in the description when they become available.

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Ohm's law doesn't have to be confusing.

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In a simple circuit there's only one voltage, one current, one resistance, and one power.

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When we get into series, parallel, and combination circuits we will have multiples of each value

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but I'll show you how to handle that when we get to that point.

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Just remember we really only need to memorize two formulas.

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E equals I times R and pi.

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P equals I times E.

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Then we can use triangles to solve for anything we need.

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If you want more practice with basic Ohm's Law, I have a free worksheet and answer key you can download.

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Links are down in the description.

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That wraps up basic Ohm's Law.

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Don't forget to feed the algorithm with all the things the algorithm praise.

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Like, comment, and a subscription if I have earned it.

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See you on the next one.

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Bu dersin kelimeleri ve konuşma notları

Bu videoda gölgeleme çalışması için 168 cümle ve 1967 kelime var. Konuşma bölümü 11:24 sürüyor. Konuşmacı dakikada yaklaşık 173 kelimeyle, günlük konuşmaya yakın doğal bir hızda konuşuyor. Kelimelerin yalnızca %73’i İngilizcede en sık kullanılan 3.000 kelime arasında, bu yüzden kelime dağarcığı zorlayıcı.

Bu videodaki önemli kelimeler

Videodan öğrenmeye değer 15 kelime, telaffuzu ve anlamıyla:

Kelime	Telaffuz	Anlam
formula isim	/ˈfɔː.mjʊ.lə/	formül
voltage isim	/ˈvəʊltɪd͡ʒ/	gerilim
litter isim	/ˈlɪt.ɚ/	altlık
triangle isim	/ˈtɹaɪˌæŋɡəl/	üçgen, üçbucak
watt isim	/wɑt/	watt
leaf isim	/lif/	yaprak
solve fiil	/sɒlv/	çözmek, halletmek
calculate fiil	/ˈkælkjʊleɪt/	hesaplamak
derive fiil	/dɪˈɹaɪv/	sağlamak, türetmek
parallel sıfat	/ˈpæ.ɹəˌlɛl/	paralel
pipe isim	/ˈpaɪp/	düdük, kaval
plug isim	/plʌɡ/	fiş
algorithm isim	/ˈælɡəɹɪðm̩/	algoritma
gallon isim	/ˈɡælən/	galon
hose isim	/hoʊz/	hortum

Duyacağınız deyimsel fiiller

Kelime	Anlam
put out fiil	çıkarmak
find out fiil	anlamak, ortaya çıkarmak
wrap up fiil	paketlemek, (bir şeyi) sarmak

Bu videodaki dil bilgisi

Konuşmacının en çok kullandığı yapılar, videodaki sözcüklerin aynısıyla:

Yapı	Videoda
Edilgen yapı be + fiilin üçüncü hâli — kimin yaptığı değil, ne olduğu önemli	is symbolized · would be thought · is measured
Present perfect have/has + fiilin üçüncü hâli — geçmişte olan ama şimdi de önemli olan bir eylem	you've come · we've learned · We've just talked
İlgi cümlecikleri who / which + cümle — bir kişi ya da şey hakkında ek bilgi	force, which is · contender which can

Dikkat edilecek telaffuzlar

Konuşmacı don't, I'm, we've gibi kısaltılmış biçimleri 27 kez kullanıyor. Bunları duyduğunuz gibi kısa söyleyin.

“th” sesleri: algorithm /ˈælɡəɹɪðm̩/, thunder /ˈθʌndɚ/, algorithmic /ˌælɡəˈɹɪðmɪk/
“sh” ve “zh” sesleri: calculation /ˌkælkjuˈleɪʃn̩/, representation /ˌɹɛp.ɹə.zɛnˈteɪ.ʃən/, examination /ɪɡˌzæm.ɪˈneɪ.ʃən/, demonstration /dɛmənˈstɹeɪʃən/, subscription /səbˈskɹɪpʃən/
Uzun kelimeler — vurguyu doğru yere koyun: electricity /ɪˌlɛkˈtɹɪsɪti/, electrical /ɪˈlɛktɹɪkəl/, representation /ˌɹɛp.ɹə.zɛnˈteɪ.ʃən/, examination /ɪɡˌzæm.ɪˈneɪ.ʃən/, eliminate /ɪˈlɪm.ɪ.neɪt/

Bu videoyla nasıl çalışılır

Videonun tamamını konuşmadan bir kez dinleyin ve bilmediğiniz kelimeleri not edin.
0,75× hızla başlayın, cümle cümle tekrar edin ve kolaylaşınca normal hıza dönün.
Kendinizi kaydedin ve orijinaliyle karşılaştırın; formula, voltage, litter gibi kelimelere özellikle dikkat edin.

Gölgeleme Tekniği Nedir?

Gölgeleme, başlangıçta profesyonel tercüman eğitimi için geliştirilen ve çok dilli Dr. Alexander Arguelles tarafından popüler hale getirilen, bilim destekli bir dil öğrenme tekniğidir. Yöntem basit ama güçlüdür: ana dili İngilizce olan bir sesi dinler ve hemen yüksek sesle tekrar edersiniz — konuşmacıyı 1-2 saniye gecikmeyle takip eden bir gölge gibi. Pasif dinleme veya dilbilgisi alıştırmalarının aksine, gölgeleme beyninizi ve ağız kaslarınızı gerçek konuşma kalıplarını eşzamanlı olarak işlemeye ve yeniden üretmeye zorlar. Araştırmalar, telaffuz doğruluğu, tonlama, ritim, bağlı konuşma, dinleme anlama ve konuşma akıcılığını önemli ölçüde geliştirdiğini göstermektedir — bu da onu IELTS Konuşma hazırlığı ve gerçek dünya İngilizce iletişimi için en etkili yöntemlerden biri yapar.

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Shadowing Practice: Basic Ohm's Law For Electricians - Learn English Speaking with Video

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