What is Resistance/Impedance (Ohms) - Why electricians need to know it

Resistance is a very important element of an electrical circuit. As electricians we use the term impedance more than we use resistance, as impedance refers to AC circuits - whereas resistance refers to DC.
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Resistance and Impedance are both methods of slowing down current enough for it to be usable. When current is unimpeded (meaning no resistance in it's way) it can create an immense amount of heat, which may melt the insulation off of the wires or cause the wires to start welding themselves together. This is a very dangerous and dramatic event when it does happen.
So putting a coil of wire in the middle of the circuit slows the current down to a usable level. Most appliances on electrical circuits operate because there is a coil of wire on the inside of them. When current leaves the source and travels into the appliance, it has to travel through instructors and capacitors on its way out of the appliance and back up to the source. In an AC circuit the direction alternates this happens 60 times per second. This works the same way in a standard DC circuit, except with the DC circuit there are resistors, so we call these circuits resistive circuits.
Impedance in an AC circuit has 2 parts that make it up. Inductive reactance and capacitive reactance. I will get more into these in a later video, but for now just understand that there is a definite relationship between a capacitor and and inductor in how they affect current in an AC circuit. An inductor and a capacitor act to cancel some of the effects of each other out if they are both introduced in a circuit. However if only one is in the circuit it will act opposite than the other one would. For example if an inductor is in the circuit, you would have an inductive circuit that would make the Voltage waveform lead the Current waveform. Conversely in a capacitive circuit, the opposite would occur - you'd have a Current waveform leading a Voltage waveform. More on this later.
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[@adamelliott6112]

The charge on a plate in a capacitor is not caused electrons repelling each other, it's caused by electrons building up on the negative plate and being attracted to the positive plate but not being able to jump the insulating gap between the two. Inductive reactance is caused by the expanding and collapsing magnetic field, which is caused by the fluctuating intensity and direction of current flow. When the lines of flux pass through the neighboring loops of wire in the coil, a voltage is induced that opposes the source voltage. Same concept as a shake flashlight. And also pretty much every part of our electrical infrastructure-

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You are doing a great job..... I think you are going to end up like your Master friend that left the field to be a teacher. I can tell you have a heart for teaching. A couple of things you missed or skipped over (1) one important factor that people don't really understand is the effect of distance (multiples of 100 ft) require stepping up your wire size every 100 ft. You did mention using the "Correct wire size" but you can get in trouble thinking that a #12 wire is good for 20 amps and forgetting to calculate the distance to the load.....etc (2) When you drew your load panel you didn't show your Ground being attached to a ground rod, building ground or plumbing ground (copper or steel pipe) If I have a subpanel more than 100 ft from the Main Entry load center I create another grounding point.

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Thanks for watching my friend, me doing these videos helps me find new ways of explaining this stuff so I feel like it's making me a better teacher as well. Glad you find some value in it!

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Electrician U I enjoy the videos and content this channel and your other channel have. It makes me a better technician and for that I thank you.

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Great simple explanations, I have been going to school for a year, no body explain ground like this to me. Completely got it.huge thanks.👍

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Great work - thanks!

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dude I love your channel soo much, it super informative and you explain things and break it down to its simplest form. I'm a 7 year electrician (mainly residential), and I reference your videos for various things. I went to a pretty crappy trade school in my area for 3 years and honestly feel you've taught me more in a matter of weeks as opposed to years in a curriculum that seems rushed and the teachers are just there to collect a paycheck. keep up the great content pal, your changing lives out here

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Great explanation!

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i love ur teaching strategy....glad am learning

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Big fan. I just started my preapprenticeship, I have been watching alot of your videos and they have been very educational. Thanks for the help

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You're a great teacher Dustin!!!

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Its so incredible to learn from a master.

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thanks for taking the time man much appreciated

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Apprentice here... appreciate everything you post man keep it up

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thanks for putting all this terminology in simple terms. keep those videos coming please!!!!

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Very fascinating, great video and explanations.

[@robertmitchum2972]

Excellent series on the electrical trade! I really enjoy and find your videos very precise and informative. And I’ve been doing this crap for over 40 years now... Great explanation of resistance verses impedance. Yes, do a video on capacitance, inductance, reactance. Explain what each component is and how it factors into a circuit, should be very interesting.... Use these terms and equations in the RF world as well, now that’s when it gets really interesting!

[@vince6829]

Nice, simple, explanation. Thank you for sharing your knowledge.

[@MrTipSzy1]

thx man! great stuff along my apprenticeship

[@a11ten071]

Great video Tnx for taking the time to share!

[@ncooty]

2 things I've long found odd: 1. We usually use impedance rather than conductance, which is a much more sensible concept. 2. Many instructors use equations as explanations. Equations are descriptive and predictive; they are not explanatory. (E.g., ask most instructors what a resistor is actually doing to voltage and current. Most refer to Ohm's Law rather than explaining what's actually going on conceptually and causally.)

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Excellent video, featuring the wind as guest host!

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I have learned more from you, than any "professor" at my trade school. Thanks man!

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Excellent explaining! Like on light bulb hot brings the power and meets the neutral build resistance and turn on light. Thank you for this video I appreciate your time and knowledge.

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You're a very good teacher! I need you to cover more of the math and calculations. I'm struggling with that the most.

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A great review and a great instructor.

[@christopherocampo9474]

Hey Dustin can you make a video demonstrating voltage, amps, and resistance in Residential and how I can use those to help me solve electrical problems?

[@jrdn.lauren]

That's way too vague of a question to be taken seriously. You expect a certain voltage ± a few Volts. but if you have resistance in the circuit you'll get a lot less. Usually caused by a loose wire somewhere in a wall. This is very very bad because high resistance = hot which might mean 🔥. End of lesson

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Bro u n the other dude Eric teaching me great tips love ur content especially journey to master series I’m an avid watcher I love the grind of being a electrician nice to share the passion with u n also helping me becoming an electrician

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DUSTIN your the best bro ,I'm learning so much from you I'm very grateful

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Brilliant, thanks 👍

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Beautiful explanation

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Another awesome video.

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You are so helpful.... From Fort Myers, FL..

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You’re an awesome down to earth dude love learning from you

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Thank you for the videos brother. Trying get back in the field and your videos helping me get the comb webs off this apprentice. 💪💪

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Holy shit you answered the question i needed in under 60 seconds with an intro; yet i still plan on watching the rest.

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Great explanation

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What is phase. And does it go 90 degrees? Thanks best channel out there.

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I appreciate your videos so much you are a great teacher man. Getting into this trade is the best decision I've made in my life and you have a simplistic way of explaining things that makes it click in my heas

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Outstanding video

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Right on Dustin!

[@travissalinas732]

Hey Dustin. 1st time viewer here. Thank you very much for your clear explanation of impedance and resistance. I have a suggestion. You may already have this, but I am interested in knowing the proper way to approach an electrical panel, remove the panel, and what i'm looking for as far as what was done right and what was done wrong. Please refer me to the corresponding video of yours if you already have made such a video. Thank you for your time and God bless brother.

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Damn this answers so many technical questions. Thank you!

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Excellent video

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You're so dam practical. You're a master at your craft.

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Thank You. From Fort Myers, FL.

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[@akitaing2671]

You are a great teacher thank you man

[@josephvanwye7825]

Impedance also accounts Capacitive and inductive reactance along with resistance. Cool video

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Another great video. Better than in the class lecture.

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Great videos

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Your an awesome person. I appreciate you.

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Man, awesome. I'm getting out of the Navy Active Duty, but thinking I want to become an Electrician.

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Awesome videos very nice

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Your way better than my suckie ass instructors in my trade school. Thanks man

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Keep it up!

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Hey I was looking forward to your videos in depth on capacitive reactance and inductive reactance bro dont forget about them.

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kee p up the good work

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That was awesome sir. It added value to me

[@ElectricianU]

Great my friend! That’s what I aim to do!

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Thank you 🙏

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You're the man.

[@noferblatz]

The resistance in a bulb filament isn't because it is coiled. You can have straight filaments. It's the material itself which resists the flow of current. Same thing with toasters or any other resistive loads. If I'm not mistaken, coils on a DC circuit don't present resistance. That's only true for AC (impedance), where the back and forth of current flow collapses and reforms the magnetic fields.

[@mr.c3928]

All I can say is thanks Dustin!