May 2

All right let's take a look at this calculate the reciproc circuits getting that four ohms that it's too long so that describe what happens in brightness to date added all right in parallel circuit different than a series circuit add branches did the branches we have more Pathways for current flow so they overall current and now one way to test that belief is to actually plug in the numbers the adding the letter c resistor the second diagram increase current therefore the power increase as the brightness okay so we're actually drawing more current from the same battery and where provide a voltage equals battery at both branches so the parallel circum tend to wear battery down faster going to see something called kilowatt hour it's for kilowatts that are used and given out okay just doesn't sound if you're giving something in Watts converted killer ones he wants to come to 0. Okay if we want to figure out how much it costs and if we need to know what is the charge from The Electric Company per kilowatt hour in this case tell us he sent purple blood out so it's multiply it out and that would tell me how much money 24 hours 30 days we're going to find that it be three dollars and 46 charge per month 8 cents 24 hours 30 of those 24 hours for a total month $3.4 it makes in the second example we have a 750 watt hair dryer right away I think of myself I need to take change watts to kilowatts by In This conversion pack by a thousand Watts at 0.7 it's used for 15 minutes okay so I just make a fraction of this okay there are 415 in one hour because it's 0.1 and that means that have 01 since day 365 days for total $5.48 that makes sense then but so that's not very expensive is it for 15 minutes every day for one year it's going to cost $5.48 are any questions about it all right answer key to this is up online the answer key to the circular tracks that started in class also online i've got overpower series complex kilowatts I have one more practice sheet and work on and make sure that you own your skills then close the answers later to that at practice sheet and right here assessment has 15 multip le choices and then free response after that and that'll be next class. So there will be one bonus that'll be a compliance service and you can figure that one out your questions on that let me know this last year the okay yeah it's not going to be a part of the main system the phone is bad right now is there any back here I'm placing a couple of our work assignments for Zack and each person is the series and the other one is what a graded lab there's a check mark please accept that it's full credit but there's a score on it then cart okay in the network Danielle when i hope they will also Root Down. Sofia bellamo please come on up merry Christmas have a conversation it I didn't hear what she said oh yeah the time to thank you okay all right great can you come up please I even flip that cigarette convert yourself correct one so that doesn't cut it right what I can tell you is okay and 1 over the equivalent today th 775. Show the work the passenger Danielle what's the name of the unit for the resistance key and homes always ready near you please directions train potential electric energy per amount charge central electric energy potential cost current to flow the potential electric energy fertile Mountain yard all right so I want to give you guys a couple notes that you should include in your notebooks in advance of the assessments if you guys can take out your notes or make a note of this somewhere you'll see it again pretty soon additional things to know central electrical for electron is circuit the charge how much energy that electron has is known as whole current won't flow unless you have a closed circuit with the potential always exists inside of a battery okay electric Power is see what I times be can also say great work okay great of work done remember that you have worked okay so you have a battery and you have a light bulb light bulb capacity energy side so the electricity can blows through back out that's essentially how an incandescent light bulb works the electrical current flows through required side of the light bulb brightness of that depends on power rate of the work done the current occurs because we have voltage which again is potential electrical energy per amount charge the electrons flowing through here how much the electrons have in terms of your energy depends upon that battery has a muscle that influences the current the other thing I didn't side of okay that's how we think about it all right so I think we have enough resources I'm working on answer key for that last packet syrup there we have one bonus in the combination Circle they've never gone over that but if you can figure that one out bonus all right thought about. Well we only have 15 minutes so you should have been 20 call I just want to do well on that assessment I don't know folks I'm retakes I've got to put yourself on the way sir so let's get it right the first time 60 minutes and look through a review answer some circuits here cuits but yeah all the answers were there please take a look about any more time the references that we have and dance assessment going on doctor. So next to review class. No the first one go apart the second one covered a series circuit or we're going to look at a parallel circuit and we're also going to take it further exploration of power today this particular worksheet that you guys have up here and the series parallel also have some questions about power very similar in the expectations on the actual assess right. I'll come up and pick up the practice skills check one of them back real quick hour ago I can't hear it for what.. this so we got three only here and we have six homes that are here come over to the battery and provides 10 volts 10 these resistors are connected in parallel circuit the total resistance circuit added of the setting that equal to one over to see that time and time again that then we're going to have the greatest common denominator or we're just going to divide it out with our calculator madonna 's one question recip 5 x3 again two homes are so they sort of resistance and circuit is too old the potential difference across our one is 10 volts and it doesn't matter in a parallel circuit doesn't matter which branch you're looking at each brand will have the same voltage as the voltage provided by the battery okay that's how it works the current through our one is different though the first thing I would do when I see a current question related to parallel circuits is definitely overall current of a certain so I can do that to see the high times are or it's too old known and voltage cheese and it's in my current total is 5 minutes it's not what they asked us that they want to know what is the current specifically in either the branch well I calculated totally because I would add the current location to Keto turns out of the battery if it split up and reach like that all right so the current you are what's up here at the top five times are unknown down here V is equal rights and more then so there is just six old current cuz I know ts of life and by 6 what then 1.7 yeah it's not a coincidence hopefully 7 + 323 is equal to 5 5 amps is your total start with that and then check your work and calculate the night each range or charlie the total resistance and circuit difference across are one what we're excitable the current through R1 is what Yen say it again current through R1 is if it help Alex I wasn't sure what we have five owners of it here at Seven Oaks and we eds where this is the 10 volts and that's 10 volts because parallel circuit both branches will have the same facility if I have 5 points calculating current for this branch okay potential difference Madeline such a difference across R2 is what 10 volts the current through R2 hello is 1. Okay awesome that's amazing what I can draw your art instead of homes and I you're going to find it out and get one point for local how are you today all right the other thing you can do is check your work is do the work release definitely do it and know that hit 10 I told her resist ance okay it's supposed to be branches should add up price. Are we fine what difference it's already listed right there and a parallel circuit the potential difference or voltage branch is equal total it doesn't mean the same as a series circuit series circuits you have to calculate the voltage of I said soon everybody got 100% on that can you put it into the Inbox and make sure that you take this sheet out you should have it from last class. Otherwise there's a few extras here it's called like 15% Electric Power can go on all right handed this out last class for you so I think you might have coffee at tomorrow take faster than Eric i'm going to pay attention twice right all right did he resistors in the circuit diagrams are soon to be light bulbs remember the powers directly related brightness of the ball okay so describe what happens the brightness at me right with d is added provide your answers to turn voltage current so we're adding d want to know what's happening to me so the voltage right of this is a series circuit so the voltage will drop amongst these resistors if we add another resistor because the total voltage passport resistors okay in other words the total is equal to B1 + B2 + B3 + is smaller the voltage is the shared most of the persistence this is different than a parallel circuit okay now brightness is determined by the power equation powers and lots okay it's a decreasing the current decreases the power also reduce the amount of current that's been blowing through here when we add resistance it's like it a garden hose printing flow of current all right this is for those two reasons life won't be less bright questions all right next question says describe what happened to the brightness of light bulb a when an additional battery is added to the diagram it has to pierce the before in the after coming up all right so adding voltage provides more occurrence is that right so we have more moltage over here so half hour increase the brightness is the brightness of the Fall is related to power power is related to her questions live every to the other side cuz look through the answers which I don't posted on Schoology you can go over to school with GMC answers here they are right here