Let's Talk About COMBINATION Circuits: Voltage, Current, Resistance, and Power

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We have talked about series and parallel circuits. But have you ever wondered how a series circuit works or what it even is? In today’s episode of Electrician U, Dustin covers part 3 of our topic on circuits- Combination Circuits!
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A combination circuit is simply a circuit that has properties of both series circuits and parallel circuits within it. And, remembering that trying to figure out values for Voltage, Amperage, Resistance, and Power each require different formulas depending on what type of circuit it is. So, the easiest way to calculate values for these in a Combination Circuit is to simply start adding all the groupings of parallel circuits resistances together (this will need to be done a few times depending on how many there are) until we are left with a simple series circuit!
Let’s review the rules. Voltage- in a series circuit voltage is dropped across each resistance while in a parallel circuit it’s constant. Current- in a series circuit current is constant but is proportional to the resistance in a parallel circuit. Resistance- in a series circuit resistance is the sum of all the resistances while in a parallel circuit it is the inverse. The formula for wattage in a series circuit Pt=I squared x Rt and in a parallel circuit its P=E squared/Rt.
Let’s do one. Say we have a 100v power source and a combination circuit of 7 loads with the following resistances- R1-1, R2-2, R3-3, R4-4, R5-4, R6-3, R7-2. R6 & R7 are in parallel with each other, R4 & R5 are in parallel with each other, and those 4 are in parallel with R3. We will add R4 & R5, R6 & R7, and then add those together and then add it to R3. Since each set has only 2 resistances, we can use the product over sum method. Adding R4 & R5 we wind up with 1.7 ohms. Adding R6 & R7 we end up with 1.2 ohms and adding those together we have 2.9 ohms. Now we can add R3 and R4567 and have an end result of 1.18 ohms! Now we have 3 loads in series with one another and can complete our calculations!
The total resistance of our circuit is the sum of all the resistances- 1 + 1.18 + 3= 5.18 ohms. The total amperage of our circuit is the voltage divided by the total resistance- 100/5.18 ohms or 19.3 amps. Voltage is dropped across each load and is equal to the source voltage. The formula is amperage multiplied by the resistance = voltage. R1- 19.3 x 1= 19.3v. R2- 19.3 x 1.18= 22.8v. R3- 19.3 x 3= 57.9v. Add those together and we have 100v or our source voltage! Lastly, we have the power to work out. Amperage x the voltage of each load = the power consumption of each and we would add those 3 values to get our total circuit power. P1- 19.3 x 19.3= 372.5w. P2- 19.3 x 22.8= 440w. P3- 19.3 x 57.9= 1117.5w. And our total power for the entire circuit is the additive of these. 372.5w+440w+1117.5W=1930w.
We hope this has been helpful in understanding how combination circuits work. Make sure to check out the other 2 videos for Series Circuits and Parallel Circuits! Both are super helpful in understanding how each one works and how they come together in a Combination Circuit! Is there a topic you would like to see discussed here on Electrician U? Leave us a comment in the comments section and let us know. Please continue to follow Dustin Stelzer and Electrician U as we are constantly updating our content to assist our followers in becoming the best electricians that they can be.
#electrician #electrical #electricity #parallel #circuit #voltage #current #resistance #power

[@ghtxbarbers]

Your video are very clear and explained well I just clicked that subscribe button! Thanks for sharing.

[@stevesargent4269]

Keep up the Ohms Law info! Essential to learning the basics!

[@mikepeters5785]

Well done. For us electricians it’s a nice refresher but if you’re trying to teach new would be apprentices, maybe slow down a little. Maybe explain that the current that’s flowing is coming from the supply so it doesn’t sound like it’s just magically appearing, and after you sum up the resistances, then you can break them down again to see the current that flows in each branch of the circuit. And further to the power dissipated by each resistor in each parallel branch. You scratched the surface nicely, but there’s a lot more to it.

[@rzawistowski33]

I'm new to learning this stuff, but it's still good so long as I watch alot of content I can start connecting to dots. Kinda like a kid playing ball with an older sibling, yeah I suck but I can learn alot faster than they did.

[@munecawilliams7239]

I'm a beginner and he explained it nicely 👌

[@EnProto]

Timing this video right around when 1st year apes are going through DC combo circuits is a good move!

[@munecawilliams7239]

I was stuck on a problem and you helped tremendously. Thank you❤🎉

[@mr.c3928]

Dustin, I understood v. drop in a better way. Thanks 🇺🇲

[@val3077]

I appreciate you so much!!

[@scroopynooperz9051]

This is essential info for the prepper - everything is going to sh!t pretty quick now and it's important to know you can do some basic maintenance and repair when the time comes. Thanks for the upload.

[@Sembazuru]

Flash back of my basic electronics course. Next step, evaluate a Wheatstone Bridge. Well, for electronics that is a next step to learn how to use a Wheatstone Bridge to make a simple resistance meter and then see how to apply that for various sensors that use a variable resistance for the sensing element (strain gauges, temperature sensor, etc). Are Wheatstone Bridges used much in electrician work?

[@jorgecampos868]

Thak you so much dude, you are the man. 😁😁

[@pointblank6467]

thank you, sir

[@michaelyarbrough6462]

I just wanna say I have been watching you a long time I’m getting ready to take my journeyman’s test I’m from temple Texas I found your videos and I thought it was cool that you were in Austin, anyway can you do a video about code I seen your video about exam preparation but could you do more in depth about code

[@hoffmanfiles]

You should do a video on what a parallel circuit is like do you mean a house circuit or a motor circuit. And you should do a video on what a series circuit means do you mean house. I think you should do videos that relate to the actual job. It will help us actually visualize and relate the class like preaching and Choctaw to actual on the job skills.

[@nieldcreek2098]

Well that went right over my head…

[@marie-francemayer4790]

I know that video has been up for a little while but would it be possible to address re expanding your circuit to find voltage and current through each resistor including the ones in parallel

[@troybrown5663]

Can you do video on ARMS (Arc Reduction Maintenance System) Circuit breakers above 1200A?

[@austinduty7504]

Hey Dustin, you’re in MA now, are you gonna offer a continuing ed or a 6 hour for MA electricians?

[@ikeraiser266]

op is it possible to use a gfci outlet in a dc to ac inverter device without the need for a gfci breaker?

[@jgleigh]

If you're just looking for power through the loads, it'd be easier to just use (current-squared times resistance). No need to solve for voltage drop first.

[@MaxTor2112]

I wish you would have finished the values for the completed circuit. Anyway, thx

[@BlackHoleForge]

As the bell strikes midnight, another video is released. Hopefully I'm not too tired to understand it. Hey, but we always have tomorrow.

[@brandonmeraz2440]

Love this video, but you where going a little to fast for me on the whole resistance multiplication and adding equation stuff 😮😅

[@weeb6180]

I think it’s funny I buy my first meter tester and I was trying to learn the things I didn’t know what they were thanks

[@brucefay5126]

Just wondering why you did not complete the analysis and figure out the voltage across, current through, and power for each of the original resistors?

[@Sembazuru]

Probably for time reasons. There may be a part II that breaks down the voltage drop, current flow, and power for each of the other resistors. Lots of whiteboard slides. ;-)

[@Environmenthrall]

Resitance 7:03

[@nathanrobinson8679]

What happened to R2, R4, R5, R6, R7? Volts, Amps and Watts? Noooooo I needed to know. lol

[@johnlarsen4546]

Once again, is amperage a word??

[@anthonyesposito7]

Yes

[@natepeterson7145]

Of course

[@FishFind3000]

Lol, it’s such a word that he deleted the video!!!😂😂😂

[@martf1061]

How is this supposed to be relevant for a construction electrician??? I learned it in trade school, but never had to use this knowledge in 25 years as an electrician. The only thing that goes in serie with other things in parrallel, are switches or contacts...

[@tedlahm5740]

Christmas tree string of lights. Plug at one end receptacle at the other end. The bulbs are in SERIES. Plug in a second string (to the mentioned receptacle) the two strings would be in parallel. Comment please.

[@tedlahm5740]

Current portion for the mentioned Parallel resistors (load)? Otherwise clear concise information. thank you

[@martf1061]

@@tedlahm5740 christmas lights in serie..? It has been almost 20 years since i have seen it ... They stopped doing this because it was a pain in the ass to find the defect bulb .

[@garbo8962]

Most Christmas strikes be contain believe its a resistor in parallel with the light bulb. If t un e light bulb burns out rest of series light bulbs remain lite but if you remove any working or non working light bulb from socket the entire set goes out ( some!are lamp sets may consist of two or three sets of series circuits.

[@jorgecampos868]

If you are to chose a teacher chose this one if you don"t understand this guy I don't know what can I tell you 😁😁

[@carnagemaximum2959]

First?!