1 00:00:00,820 --> 00:00:27,420 Okay, in order to finish the measurement of the electric values, voltage, resistance and current, I'm going to complete the activity by mounting circuit 0.5 with the data we got when we did the paper activity 18 and using the same simulator 2 00:00:27,420 --> 00:00:39,359 So, in activity 18 we had a parallel circuit with a 5 volt battery and three different lamps 3 00:00:39,359 --> 00:00:46,140 The resistances of each lamp are 10, 25 and 5 ohms 4 00:00:46,140 --> 00:00:50,520 So, the first thing I'm going to do is to mount the circuit 5 00:00:50,520 --> 00:00:54,640 So, we need a parallel circuit with three resistors 6 00:00:54,640 --> 00:00:56,320 One, two and three 7 00:00:56,320 --> 00:01:01,219 And complete the circuit by adding some wires 8 00:01:01,219 --> 00:01:03,539 These wires 9 00:01:03,539 --> 00:01:08,640 Here, there and this one 10 00:01:08,640 --> 00:01:12,540 Let's see if the circuit works 11 00:01:12,540 --> 00:01:15,780 Ok, the circuit is working 12 00:01:15,780 --> 00:01:21,459 Now I need to change the resistances 13 00:01:21,459 --> 00:01:23,280 And we said that they were 14 00:01:23,280 --> 00:01:42,219 Let's see again, 10, 25 and 5, ok, 10 ohms, 25 and 5, and the battery is a 5 volt battery, ok 15 00:01:42,219 --> 00:01:51,739 Now we need to activate the multimeter and in this case we need to use it as an ammeter, clicking there 16 00:01:51,739 --> 00:02:04,640 It says here, we need to read this, that to measure currents, we need to drag the probes, this and this one, onto the test point immediately before the branch 17 00:02:04,640 --> 00:02:11,080 The branches of a parallel circuit are these, one branch, another branch, another branch 18 00:02:11,080 --> 00:02:16,939 In a series circuit, we only have one single branch 19 00:02:16,939 --> 00:02:27,400 So, to measure the current through lamp through resistor number 1 20 00:02:27,400 --> 00:02:30,960 We need to open the circuit in this branch 21 00:02:30,960 --> 00:02:32,020 Let's see how 22 00:02:32,020 --> 00:02:38,159 So, first we draw, we drag the probe onto this point 23 00:02:38,159 --> 00:02:42,680 And we have two green dots 24 00:02:42,680 --> 00:02:47,500 I'm going to measure the current through this branch or this other branch 25 00:02:47,500 --> 00:02:50,699 I'm going to measure the current through this resistor 26 00:02:50,699 --> 00:02:53,900 So I place the probe there 27 00:02:53,900 --> 00:02:58,139 And now I see that we have an open circuit here 28 00:02:58,139 --> 00:03:01,199 When we close the circuit 29 00:03:01,199 --> 00:03:04,819 We see the current through this resistor 30 00:03:04,819 --> 00:03:09,879 Look, when the current comes out of the positive terminal of the battery 31 00:03:09,879 --> 00:03:12,419 Goes through this path 32 00:03:12,419 --> 00:03:16,099 this pathway, go up to this point 33 00:03:16,099 --> 00:03:19,979 then continue through the probe 34 00:03:19,979 --> 00:03:24,259 enters the ammeter, goes out of the 35 00:03:24,259 --> 00:03:27,080 ammeter and continue through the circuit, ok? 36 00:03:28,280 --> 00:03:32,240 that is the way that ammeter 37 00:03:32,240 --> 00:03:36,039 measures current, so now we have 38 00:03:36,039 --> 00:03:40,280 0.5 amps, let's see here what we had 39 00:03:40,280 --> 00:03:44,919 The same, 0.5 amps 40 00:03:44,919 --> 00:03:47,599 Let's see if we have the other measurements 41 00:03:47,599 --> 00:03:53,120 Ok, I'm going to measure now the same here in this branch, the second line 42 00:03:53,120 --> 00:03:58,740 So I place the probe there and this here 43 00:03:58,740 --> 00:04:03,120 The same thing, we have an open circuit here 44 00:04:03,120 --> 00:04:10,060 But it's not a real one because in between these two points we have the ammeter 45 00:04:10,060 --> 00:04:15,620 And now what we have is 0.2 amps 46 00:04:15,620 --> 00:04:16,819 Ok 47 00:04:16,819 --> 00:04:21,759 For the last one, instead of placing the probe here 48 00:04:21,759 --> 00:04:23,779 I'm going to use this branch 49 00:04:23,779 --> 00:04:26,199 Because it's exactly the same branch 50 00:04:26,199 --> 00:04:27,639 As you can see here 51 00:04:27,639 --> 00:04:30,139 This branch is the same as this 52 00:04:30,139 --> 00:04:33,740 So I place the probe there 53 00:04:33,740 --> 00:04:36,639 And it says 1 amp 54 00:04:36,639 --> 00:04:38,120 Let's see here 55 00:04:38,120 --> 00:04:39,259 1 amp 56 00:04:39,259 --> 00:04:58,259 So, it works. The total current through the circuit, I mean the current that the battery generates, is through this branch, through these wires. So, I can check that measuring the current through this branch. 57 00:04:58,259 --> 00:05:00,660 Ok, let's see 58 00:05:00,660 --> 00:05:04,660 Here, the red probe 59 00:05:04,660 --> 00:05:07,420 And now, to measure the current through this other branch 60 00:05:07,420 --> 00:05:09,060 I need to place it there 61 00:05:09,060 --> 00:05:12,120 But I was saying the total current 62 00:05:12,120 --> 00:05:14,660 And the total current has to be 63 00:05:14,660 --> 00:05:19,319 0.5 plus 0.2 plus 1 64 00:05:19,319 --> 00:05:21,779 1.7 amps 65 00:05:21,779 --> 00:05:23,259 Let's see 66 00:05:23,259 --> 00:05:26,920 exactly 67 00:05:26,920 --> 00:05:30,360 1.7 amps 68 00:05:30,360 --> 00:05:31,199 in total 69 00:05:31,199 --> 00:05:32,660 and that's it