/ News & Press / Video / EXP03 - TO DETERMINE THE CAPACITANCE OF CAPACITORS IN SERIES AND PARALLEL _ PHYSICS DEMO CLASS
EXP03 - TO DETERMINE THE CAPACITANCE OF CAPACITORS IN SERIES AND PARALLEL _ PHYSICS DEMO CLASS
WEBVTT Kind: captions Language: en
00:00:02.090 hi so this is our lab number three items 00:00:09.54900:00:09.559 we have two digital multimeters and this 00:00:15.11000:00:15.120 experiment you'll find different 00:00:17.32000:00:17.330 multimeters like I mentioned earlier we 00:00:21.85900:00:21.869 have an amplifier we have a two-way 00:00:25.00900:00:25.019 switch that turns both sides okay and 00:00:31.18900:00:31.199 then we have connecting bonds we have a 00:00:35.47900:00:35.489 power cable okay and then you have our 00:00:38.72000:00:38.730 power supply here that is running up to 00:00:43.15000:00:43.160 450 we also have our capacitance this is 00:00:51.41000:00:51.420 one micro filari 00:00:53.08000:00:53.090 this is 10 nano selecting and then we 00:00:56.95900:00:56.969 have one nano farad here okay we have 00:01:02.42000:01:02.430 also connecting cables and these are the 00:01:07.16000:01:07.170 items that we use to do our setup as I'm 00:01:11.63000:01:11.640 going to demonstrate for you 00:01:17.58000:01:17.590 so let's get to the connection we have 00:01:22.48000:01:22.490 with a power supply to cables and this 00:01:29.14000:01:29.150 we need to have a voltmeter that is 00:01:33.97000:01:33.980 going to measure the voltage that is 00:01:37.12000:01:37.130 applied to the capacitors and then you 00:01:40.51000:01:40.520 have our cable right yeah and then from 00:01:47.44000:01:47.450 our amplifier please read the 00:01:52.12000:01:52.130 information supplied to you in the fire 00:01:55.32000:01:55.330 so that you can get to know what each 00:01:59.05000:01:59.060 component works in clips in this 00:02:03.79000:02:03.800 experiment so it's power now we need to 00:02:08.38000:02:08.390 have all have our capacitors connected 00:02:11.56000:02:11.570 in both series and parallel so I will 00:02:17.08000:02:17.090 have my capacitors one here and then 00:02:20.08000:02:20.090 another one for 10 nano further here 00:02:25.65000:02:25.660 then this is what we have and we need to 00:02:31.93000:02:31.940 apply a voltage across these two okay so 00:02:39.97000:02:39.980 again I will have two cables one running 00:02:48.88000:02:48.890 from here and then another one running 00:02:53.17000:02:53.180 from here remember this 00:02:57.66000:02:57.670 Martita is just here to only measure 00:03:00.75900:03:00.769 what is our applied voltage okay we need 00:03:07.24000:03:07.250 to have like we see it in the 00:03:09.28000:03:09.290 instructions we need of it to estrange 00:03:11.94900:03:11.959 which is this one 00:03:16.58900:03:16.599 so we need to collect I can't connect 00:03:30.22000:03:30.230 this one then I get your sign okay and 00:03:34.39000:03:34.400 then we have one more Kimbo from here 00:03:44.13000:03:44.140 from here to that two-way street point b 00:03:50.88000:03:50.890 or resign okay so this one now I can 00:03:59.02000:03:59.030 have my other cable running from point A 00:04:03.85000:04:03.860 which is this point here okay to this 00:04:09.67000:04:09.680 point as you can see in this case we 00:04:13.39000:04:13.400 have already one subject complete we 00:04:17.25900:04:17.269 look at this we have from our two 00:04:20.92000:04:20.930 capacitors connected to the voltage and 00:04:24.48000:04:24.490 we have a switch in our socket as you 00:04:28.33000:04:28.340 can see so if I connect this way that 00:04:31.48000:04:31.490 means this circuit is complete if I move 00:04:36.52000:04:36.530 this short black wire which is our 00:04:39.94000:04:39.950 switch this way then I've disconnected 00:04:42.85000:04:42.860 here so no more charging but if I 00:04:46.12000:04:46.130 connect this way now the circuit is 00:04:48.73000:04:48.740 complete that means I'm charging okay so 00:04:52.09000:04:52.100 now at the moment I'll keep it this way 00:04:54.19000:04:54.200 at Point C which is low but here so it's 00:04:58.62900:04:58.639 an open circuit right now this is not 00:05:04.15000:05:04.160 closed yet so what I need to do now is 00:05:09.52000:05:09.530 to finish up my other connection by 00:05:14.21900:05:14.229 including in our amplifier and the last 00:05:20.04000:05:20.050 the last capacitor which is going to 00:05:22.93000:05:22.940 work as our refresco pasture which is 1 00:05:25.71900:05:25.729 micro farad and let 00:05:27.64000:05:27.650 is going to be connected right here okay 00:05:35.93900:05:35.949 okay so with our first circuit then 00:05:39.74900:05:39.759 wouldn't not including our reference 00:05:43.27000:05:43.280 capacitor and the amplifier iron this 00:05:45.85000:05:45.860 again holding it okay so first our 00:05:48.21900:05:48.229 priorities okay and then now we need to 00:05:59.37900:05:59.389 have one cable connected at this 00:06:04.32000:06:04.330 Junction okay and then we need to have 00:06:09.43000:06:09.440 another cable running from this node to 00:06:16.37900:06:16.389 the other node 00:06:18.93000:06:18.940 okay so in the signal we're using the 00:06:21.87900:06:21.889 red cable but it doesn't matter so much 00:06:24.21000:06:24.220 and now we have our our capacitive Mike 00:06:29.68000:06:29.690 one my preferred right here okay so if 00:06:35.23000:06:35.240 you look at this it's like you have a 00:06:39.01000:06:39.020 second circuit which is this way we just 00:06:43.36000:06:43.370 through this switch the two is switch 00:06:46.27000:06:46.280 connected at this point C okay so this 00:06:50.37900:06:50.389 is like complete including these two 00:06:53.21900:06:53.229 okay 00:06:54.70000:06:54.710 and then that along with the one 00:06:59.80000:06:59.810 microfarad capacitor 00:07:01.81000:07:01.820 okay so we need to know what after 00:07:06.25000:07:06.260 charging this capacitor these two 00:07:08.32000:07:08.330 capacitors that are going to be 00:07:09.64000:07:09.650 connected in series and power we need to 00:07:13.08900:07:13.099 know what voltage will be stored on this 00:07:15.61000:07:15.620 reference light capacitor so that means 00:07:19.33000:07:19.340 I need to collect my voltmeter across 00:07:25.11000:07:25.120 this capacitor to see exactly what your 00:07:28.75000:07:28.760 voltage will be transferred okay so 00:07:33.45000:07:33.460 right yeah I have 00:07:36.09000:07:36.100 disconnected and so we need one more 00:07:46.00000:07:46.010 combo which is going to be discharging 00:07:49.18000:07:49.190 at all times this capacitor before we 00:07:51.55000:07:51.560 take any measurement so I need to have 00:07:57.76000:07:57.770 this cable right here okay so this cable 00:08:01.75000:08:01.760 we can either just connect it here 00:08:04.86000:08:04.870 should circuit this 00:08:07.87000:08:07.880 this capacitor I remove all the charges 00:08:10.60000:08:10.610 or I can simply plug it here all the 00:08:14.38000:08:14.390 same plug in here is the same as plug in 00:08:17.44000:08:17.450 here okay so either way so when you're 00:08:21.01000:08:21.020 asked to take a new measurement you need 00:08:22.90000:08:22.910 first discharge or discharge this 00:08:27.31000:08:27.320 capacitor by connecting here at this 00:08:30.67000:08:30.680 point or by connecting here so this is 00:08:34.30000:08:34.310 going to be every way 00:08:36.71000:08:36.720 everywhere that is moving here and out 00:08:39.75000:08:39.760 okay yeah so this car is super power 00:08:44.61000:08:44.620 socket it's done we have the charging 00:08:48.09000:08:48.100 socket which is this one we charge this 00:08:51.54000:08:51.550 and then after charging we transfer to 00:08:54.45000:08:54.460 the other socket so like if you can see 00:08:57.90000:08:57.910 this is to measure the applied voltage 00:08:59.82000:08:59.830 and if I connect here that means my my 00:09:05.91000:09:05.920 circuit charging circuit is complete 00:09:08.01000:09:08.020 because this is connected to end of the 00:09:10.53000:09:10.540 capacitor and the other one is connected 00:09:12.75000:09:12.760 to the end so that would be complete 00:09:14.28000:09:14.290 okay now after charging the capacitor 00:09:18.36000:09:18.370 that is when I turn my stretch through 00:09:21.51000:09:21.520 this other fine so that means the 00:09:24.03000:09:24.040 charging circuit is off now I have a 00:09:26.85000:09:26.860 second circuit which is like discharging 00:09:29.76000:09:29.770 through this large capacitor so this 00:09:32.13000:09:32.140 would be discharging through this large 00:09:35.01000:09:35.020 capacitor okay and the voltage that is 00:09:38.97000:09:38.980 generated on this capacitor will be 00:09:41.64000:09:41.650 measured by this multimeter and then you 00:09:46.11000:09:46.120 can make use of this voltage and the 00:09:48.78000:09:48.790 capacitance of this capacitor to capture 00:09:51.30000:09:51.310 the child that will be accumulated on 00:09:53.82000:09:53.830 this capacitor 00:09:59.00000:09:59.010 okay so let's try to take some 00:10:02.46000:10:02.470 measurements and so I begin by switching 00:10:07.68000:10:07.690 on my okay this is switched on this case 00:10:16.95000:10:16.960 you have to place a function so that it 00:10:20.28000:10:20.290 rains and the sign okay so we have this 00:10:24.81000:10:24.820 already set and it's Auto and then with 00:10:29.64000:10:29.650 this I will do the same thing have to 00:10:32.78000:10:32.790 switch now to photo to be able to 00:10:36.15000:10:36.160 measure the voltage now with this 00:10:44.24000:10:44.250 connected right this way 00:10:46.47000:10:46.480 I need first discharge power by 00:10:50.04000:10:50.050 connecting a lie here like I say and if 00:10:54.99000:10:55.000 you do that this has to almost go to 0 00:10:59.61000:10:59.620 which already is very small so I can a 00:11:05.51000:11:05.520 Doris plug here a plug here 00:11:08.51000:11:08.520 ok so as you consider voltage here is 00:11:12.87000:11:12.880 very very small and if I plug here I to 00:11:17.64000:11:17.650 decreased so let's begin by increasing 00:11:26.37000:11:26.380 the voltage here so I'll move my swiftly 00:11:34.01000:11:34.020 checking circuit and then increase my 00:11:37.74000:11:37.750 voltage to 50 which is required a 00:11:45.17000:11:45.180 starting point to be 50 00:11:52.00000:11:52.010 okay that is 50.1 okay so now in this 00:11:56.96000:11:56.970 case as you can see I've applied the 00:11:59.72000:11:59.730 rotary or 50 across with two capacitors 00:12:02.36000:12:02.370 in series and this circuit is complete 00:12:05.51000:12:05.520 okay so now it's changing after that for 00:12:09.56000:12:09.570 a short time 00:12:10.51000:12:10.520 we need to discharge this capacitor okay 00:12:16.04000:12:16.050 you can see it goes straight to zero so 00:12:19.76000:12:19.770 now after that I need three more this 00:12:23.27000:12:23.280 way and the voltage will be increasing 00:12:30.34000:12:30.350 okay so it will build up for some time 00:12:33.83000:12:33.840 and then you press hold okay 00:12:44.62900:12:44.639 so after holding you can you can unfold 00:12:50.75900:12:50.769 after taking your result so in this case 00:12:53.57900:12:53.589 it is 62 point 1 million volts so I can 00:12:57.78000:12:57.790 unfold but then I need to now discharge 00:13:01.47000:13:01.480 that capacitor and when you discharge it 00:13:04.53000:13:04.540 goes to almost zero 00:13:07.61900:13:07.629 as you can see yeah so what does that 00:13:10.47000:13:10.480 mean it simply means that of discharge 00:13:14.10000:13:14.110 or as of discharge this capacitor right 00:13:18.29900:13:18.309 so I need to move my flying blue wire 00:13:24.94900:13:24.959 back to the charging position okay 00:13:31.16000:13:31.170 increase my voltage to 100 from here 00:13:43.79000:13:43.800 okay from the increasing room so it has 00:13:48.21000:13:48.220 to be around 100 okay that's 100 maybe 00:13:55.01900:13:55.029 point seven oh that's okay so that means 00:13:59.60900:13:59.619 I'm charging this these two capacitors 00:14:05.63900:14:05.649 connected in series okay so with that 00:14:09.44900:14:09.459 remember the switches stay on the 00:14:11.40000:14:11.410 charging side now and our cable is still 00:14:15.41900:14:15.429 here this changing leaves and you can 00:14:17.78900:14:17.799 see it's around zero now I can open up 00:14:22.25900:14:22.269 here okay and then transfer to this side 00:14:27.78000:14:27.790 as you can see wait for some time and 00:14:30.86900:14:30.879 hold that's the value in it and after 00:14:35.69900:14:35.709 taking recording now we can unhold and 00:14:41.73000:14:41.740 then let's check it so 00:14:46.29000:14:46.300 take back this to the other side of 00:14:49.98000:14:49.990 collecting and now I'm moving to 160 150 00:15:11.88000:15:11.890 okay around 150 so that means I'm 00:15:17.65000:15:17.660 charging these two capacitors with a 00:15:22.06000:15:22.070 rotary or 150 so to have our switch 00:15:25.26900:15:25.279 connected that side okay now before I 00:15:29.35000:15:29.360 move my switch to this side I need to 00:15:34.42000:15:34.430 unplug this cable which was discharging 00:15:37.75000:15:37.760 oh okay so now I will flick to the side 00:15:44.13000:15:44.140 flick to the side and that goes to 155 I 00:15:51.13000:15:51.140 can stop okay and I can discharge the 00:15:58.96000:15:58.970 capacitor so this is my value that 00:16:01.21000:16:01.220 corresponds to a voltage OH 00:16:03.51000:16:03.520 150 I have $100 on 150 sitting okay so 00:16:09.46000:16:09.470 it's in the standing position with this 00:16:11.62000:16:11.630 cable now I can move on to another 00:16:13.99000:16:14.000 voltage which is 200 so I have I can 00:16:18.76000:16:18.770 turn back to this way and then increase 00:16:21.67000:16:21.680 my rotary to around 200 okay around 200 00:16:30.61000:16:30.620 and now it's charging with the applied 00:16:35.47000:16:35.480 voltage of 209 it wait for some time a 00:16:39.49000:16:39.500 few seconds with that done okay remember 00:16:44.44000:16:44.450 how now to discharge these capacitors 00:16:46.90000:16:46.910 through this so now I have to unplug 00:16:49.32900:16:49.339 this by first I'm holding here okay 00:16:53.77000:16:53.780 can't see it is zero so if I unplug this 00:16:57.19000:16:57.200 I need to fish okay 00:17:00.34000:17:00.350 that's around 200 dot 2010 I can hold 00:17:05.10000:17:05.110 200 maybe 300 13 I can hold 00:17:10.05900:17:10.069 so that's the number I need that 00:17:11.50000:17:11.510 corresponds to this applied voltage of 00:17:14.05000:17:14.060 200 00:17:15.05900:17:15.069 so nothing got down I can discharge the 00:17:23.04900:17:23.059 and then finally take back my switch to 00:17:28.61000:17:28.620 the connecting side so the process goes 00:17:33.40900:17:33.419 on like that and then for the part of 00:17:36.74000:17:36.750 the for the part of connecting in 00:17:42.54900:17:42.559 parallel people just transfer this to 00:17:48.14000:17:48.150 that okay and then don't forget this has 00:17:52.28000:17:52.290 to go back to zero because you are 00:17:54.68000:17:54.690 starting in you experience a new part 00:17:56.69000:17:56.700 and this has to be moved right here so 00:18:00.26000:18:00.270 these two are connected now in power and 00:18:02.99000:18:03.000 you are exactly doing the same thing 00:18:05.83000:18:05.840 charging discharging through this 00:18:08.29900:18:08.309 capacitor okay and then you don't always 00:18:11.60000:18:11.610 have to forget by discharging this 00:18:14.21000:18:14.220 capacitor otherwise there will be some 00:18:17.24000:18:17.250 charge carrier stored on that capacitor 00:18:20.33000:18:20.340 from the previous measurement and it 00:18:23.09000:18:23.100 will give very consistent or wrong 00:18:27.83000:18:27.840 results so this pilot is the experiment 00:18:31.28000:18:31.290 and from that we will fill up our table 00:18:35.69000:18:35.700 over in the head voltage both in sales 00:18:38.33000:18:38.340 and power and then follow can calculate 00:18:43.40000:18:43.410 the measure of the determine the 00:18:47.03000:18:47.040 determined change in nano coulombs from 00:18:51.38000:18:51.390 the fact that Q equals CV we know the 00:18:54.74000:18:54.750 charge that is we know the capacitance 00:18:57.20000:18:57.210 of this capacitor and then we know the 00:18:59.53900:18:59.549 voltage that is measured across this 00:19:01.76000:19:01.770 capacitor both in series and parallel
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