1 00:00:02,890 --> 00:00:04,620 Hello. 2 00:00:04,670 --> 00:00:11,420 Today we will look at participation in our system of resistance generate heat and the component must 3 00:00:11,420 --> 00:00:14,510 be able to submit this here to prevent damage. 4 00:00:14,990 --> 00:00:16,800 Physical size. 5 00:00:16,820 --> 00:00:24,170 The surface area available to this Betty is a good indicator indicator of how much heat Bauer at a store 6 00:00:24,170 --> 00:00:25,800 can handle. 7 00:00:25,910 --> 00:00:33,400 Measured in Watts common values are a quarter have 1 5 10 et cetera. 8 00:00:33,410 --> 00:00:41,740 Now let's look at this example there's a store and circuit series looking at the current path. 9 00:00:42,060 --> 00:00:45,280 If there is only one bath the component are in cities. 10 00:00:45,330 --> 00:00:53,460 As you can see here there is only one current path flowing through these resistors so the stores are 11 00:00:53,550 --> 00:01:02,680 in series and the main this thing shell between series and by circuit is how many bath is the current 12 00:01:02,680 --> 00:01:09,430 has available to complete the course from the negative wall to the power source to the post office or 13 00:01:09,630 --> 00:01:10,570 both. 14 00:01:10,630 --> 00:01:15,090 In this diagram all comments from the battery must pass through both registers. 15 00:01:15,100 --> 00:01:22,120 Therefore that circuit series circuit at the point unit developed the concept of equivalent resistance 16 00:01:22,780 --> 00:01:30,130 equivalent resistance is what the total resistance would be if you sub substituted a singular as a store 17 00:01:31,580 --> 00:01:34,050 that is a store that make up the circuit. 18 00:01:34,220 --> 00:01:41,330 In this case if that all the stores were to be combined and replaced with a single resistor that had 19 00:01:41,330 --> 00:01:46,720 the same resistance that single resistor would be the equivalent resistor. 20 00:01:46,760 --> 00:01:54,050 We will get a permanent resistor and replace these two as a sort of reference to now if we looked here. 21 00:01:54,080 --> 00:02:01,050 The stores and circuit series that covenant was a store will be the summation of each of these registers 22 00:02:01,080 --> 00:02:03,670 that are connected in series. 23 00:02:03,720 --> 00:02:08,140 It is easy to calculate that covenant resistance of resistors in series. 24 00:02:08,370 --> 00:02:15,520 It is a symbol the sum of all the resistance the substructure of above the fair. 25 00:02:15,630 --> 00:02:24,140 The first second and all subsystem resistance or resistance or resistance value are added together. 26 00:02:24,150 --> 00:02:33,660 For example if R1 is 100 ohm and R2 is 201 then the equivalent resistance would be 300 homes. 27 00:02:33,660 --> 00:02:44,850 Other example if our one is 50 on R2 is thinking on then are 3 and all three is a five hundred ORM then 28 00:02:44,850 --> 00:02:50,280 the equivalent resistance for these three resistance will be ten thousand five hundred five hundred 29 00:02:50,460 --> 00:02:52,900 fifty on. 30 00:02:53,010 --> 00:02:57,560 Now let's take a deeper look at this circuit are 1 and are 2. 31 00:02:57,570 --> 00:03:04,560 There is a certain circuit in series on your brutal brutal board or blackboard setup the following circuit 32 00:03:04,560 --> 00:03:07,970 using the resistance value indicated on the next slide. 33 00:03:08,450 --> 00:03:16,030 Calculate the equivalent resistance R E and measure the resistance with your Volt or meter so you need 34 00:03:16,030 --> 00:03:24,170 to provide to connect these two values resistors in the blackboard and calculate the result. 35 00:03:24,220 --> 00:03:33,810 Then you can measure the result using your volt o meter and make sure that you got it right here. 36 00:03:33,910 --> 00:03:41,660 This is a very good example so I suggest that you bought that video calculate the values here and connect 37 00:03:42,130 --> 00:03:52,500 this resistance to Brit ball then write down the values using the Volt on meet up here and compare the 38 00:03:52,500 --> 00:03:54,140 results with the calculated one. 39 00:03:56,240 --> 00:04:01,070 Take five to do this example then return back to this lecture. 40 00:04:01,070 --> 00:04:04,660 Now let's look at the resistors and circuits Bharara. 41 00:04:05,390 --> 00:04:12,370 If there is more than one way for the current to complete its bars that turn on the circuit is better. 42 00:04:12,530 --> 00:04:19,670 So the current one to return from here it will be distributed to here and here then it will take two 43 00:04:19,670 --> 00:04:21,110 ways to return to it. 44 00:04:21,120 --> 00:04:27,270 Beth So these two are connected in better. 45 00:04:27,310 --> 00:04:29,880 Now let's look at the formula. 46 00:04:29,890 --> 00:04:36,310 The left hand formula is really just the same as the right hand formula except it is for tools stores 47 00:04:36,400 --> 00:04:37,980 and butter only. 48 00:04:38,140 --> 00:04:44,070 And the algebra has been done on the right hand formula to make it a little simpler. 49 00:04:44,080 --> 00:04:49,720 We must point out that uh by the very nature of a barrel circuit the equivalence resistance will be 50 00:04:49,720 --> 00:04:57,880 less than any of the single resistors that make up the circuit sensitive the Hogans or you need to be 51 00:04:57,880 --> 00:05:06,460 sensitive to this fact so that as we go through the exercises we need to make sure that our results 52 00:05:07,490 --> 00:05:09,520 all in our results. 53 00:05:09,910 --> 00:05:18,050 They're confident that the store will be less than any of the two separate resistors. 54 00:05:18,080 --> 00:05:24,430 This makes sense if you think about it referring back to the W analogy. 55 00:05:24,590 --> 00:05:32,660 If there is more than one horse for the water to flow through each bath has a relatively narrow hose 56 00:05:33,140 --> 00:05:40,850 which is at a distance then what the water sees as it approached should the whole opening is not the 57 00:05:41,210 --> 00:05:50,150 narrow opening of just one horse as the sum or the total sum of all openings which would make it appear 58 00:05:50,180 --> 00:05:57,200 that there is one large opening to go through one large opening is like seeing one lower resistance 59 00:05:57,200 --> 00:06:07,920 pass a bath then the individual holes opening so that thing that you need to know is this formula works 60 00:06:07,920 --> 00:06:11,050 for biologists thought if there's only two resistance. 61 00:06:11,100 --> 00:06:15,780 This is for more than one batter to the store. 62 00:06:16,650 --> 00:06:24,690 So you need to get this right now let's look at a circuit example. 63 00:06:24,690 --> 00:06:30,660 As you can see here in Europe the big board set up the following circuit using the resistance value 64 00:06:30,660 --> 00:06:38,100 indicating on the next slide calculate that covenant resistance R E and measure the resistance with 65 00:06:38,100 --> 00:06:39,600 your Volt or meter. 66 00:06:39,600 --> 00:06:41,580 This is the circuit. 67 00:06:41,580 --> 00:06:42,870 These are the values. 68 00:06:42,890 --> 00:06:44,870 And please take five to do this. 69 00:06:44,870 --> 00:06:48,980 Example. 70 00:06:49,150 --> 00:06:52,950 Now let's look at this parallel challenge. 71 00:06:52,950 --> 00:06:58,950 Make a circuit with three systems and Belarus and Brother calculate their covalent resistance. 72 00:06:58,950 --> 00:06:59,690 Then measure it. 73 00:07:00,180 --> 00:07:11,990 If we have R1 350 on r tooting K the arm of three four point seven zero or now let's build the circuit 74 00:07:12,140 --> 00:07:16,970 and see um what is the covalent resistance. 75 00:07:22,810 --> 00:07:30,660 Let's look at resistors and circuit mix which means that has these unbearable transistors. 76 00:07:30,760 --> 00:07:38,770 If the best of the best for the current in a portion of the circuit is a single bath and in another 77 00:07:38,770 --> 00:07:45,790 portion of the circuit has multiple routes the circuit is a mix of series and bar circuits are usually 78 00:07:45,790 --> 00:07:54,400 not just series or bar most practices are a combination of the two in order to allow the these mixed 79 00:07:54,400 --> 00:08:00,880 circuits you need to be able to divide sections of the circuit and look at the smaller section individually 80 00:08:01,690 --> 00:08:09,280 then once each segment is analyzed the segments can be put back together to make the whole circuit in 81 00:08:09,280 --> 00:08:10,100 this circuit. 82 00:08:10,120 --> 00:08:18,430 If you look at the two C resistors in the lower left of the circuit here this is a source our end series 83 00:08:18,940 --> 00:08:24,690 the equivalent of these resistors is the symbol some of that all resistance values. 84 00:08:24,700 --> 00:08:31,360 Next the equivalent combined through the store is connected and bonded with the writer of the story 85 00:08:31,900 --> 00:08:38,170 because there are two buffers for electrons going into this portion of the circuit the equivalent of 86 00:08:38,170 --> 00:08:48,750 these two resistors is R1 multiple by R2 divided by R1 plus R2 which is the law that we mentioned in 87 00:08:48,760 --> 00:08:49,960 the slide this one 88 00:08:55,200 --> 00:09:00,380 okay now going back to our slide 89 00:09:03,960 --> 00:09:09,710 finally there is a story at the top is in series with the equivalent resistor here at the bottom because 90 00:09:09,710 --> 00:09:12,350 the count has only one death. 91 00:09:12,380 --> 00:09:20,370 This is a simple matter of how we can simplify the circuit and give the equivalent resistor. 92 00:09:20,750 --> 00:09:24,950 Now if we look to this mixed circuit 93 00:09:30,000 --> 00:09:30,610 okay. 94 00:09:36,450 --> 00:09:36,810 Okay. 95 00:09:36,810 --> 00:09:39,540 If we looked at the circuit as you can see here. 96 00:09:40,900 --> 00:09:46,430 Let's start with relatively simple make circuit and build it using your bread board. 97 00:09:46,450 --> 00:09:53,400 That one value is 330 on are two and three are four point seven. 98 00:09:53,400 --> 00:09:55,330 Care not to point to keto. 99 00:09:56,380 --> 00:10:00,280 Um let's see how we can calculate its value. 100 00:10:02,420 --> 00:10:08,300 If we take these two resistors are two and are three. 101 00:10:08,300 --> 00:10:16,900 This is the low to get the equivalent value of corn equivalent resistance from them since they are in 102 00:10:16,940 --> 00:10:22,730 parallel once we get that value which will be in that case. 103 00:10:23,070 --> 00:10:36,650 Uh one thousand four hundred ninety eight we can go further and sum these two values which are in series 104 00:10:36,650 --> 00:10:47,620 now and give the result which will be three hundred thirty on plus one thousand four hundred ninety 105 00:10:47,630 --> 00:10:54,870 eight on om and the final result will be one thousand nine hundred twenty eight. 106 00:10:54,880 --> 00:11:03,470 Or you can calculate this yourself using calculator or using your opinion Baber and this is a really 107 00:11:03,470 --> 00:11:08,660 simple example to butter and one series let's look another example. 108 00:11:08,890 --> 00:11:12,120 This is our one hour to all three are for this. 109 00:11:12,130 --> 00:11:21,790 These are their values respectively as you can see here we can start by summing are two and all three 110 00:11:22,180 --> 00:11:31,690 were in this as you can see here the equivalent resistor will be three point two kilo and going further 111 00:11:31,900 --> 00:11:40,000 we can r e r r for our in Belgrade so we can calculate their values in this low and the result will 112 00:11:40,000 --> 00:11:52,550 be as you can see here that is that will be two thousand two hundred thirty on since uh the final result 113 00:11:52,910 --> 00:12:00,050 is to have two thousand two hundred thirty ohm uh after accordingly summing the equivalent value of 114 00:12:00,050 --> 00:12:08,660 these two as a source with those and series here this that is a simple example I encourage you to do 115 00:12:08,660 --> 00:12:11,630 it at home using your Ben and Baber. 116 00:12:11,810 --> 00:12:12,690 Thanks for watching. 117 00:12:12,690 --> 00:12:15,660 Next we will discuss arms law. 118 00:12:15,680 --> 00:12:17,240 This is education and joining team.