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All language subtitles for 9. Definition of Voltage--- [ FreeCourseWeb.com ] ---

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Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00,570 --> 00:00:07,540 Now in this video we are going to discuss a very important concept in our electric circuits which is 2 00:00:07,540 --> 00:00:08,950 Zee voltage. 3 00:00:09,180 --> 00:00:16,370 So what does the voltage Zee a voltage between at two points A and to be in an electric circuit. 4 00:00:16,380 --> 00:00:24,150 It is energy or walking into to move an electrical charge or a unit at George or from Gordon from A 5 00:00:24,150 --> 00:00:25,210 to B. 6 00:00:25,230 --> 00:00:26,190 So what does it mean. 7 00:00:26,190 --> 00:00:31,650 It means that if we have a circuit like this one and that we have this element 8 00:00:35,240 --> 00:00:41,770 this element and we have here a point called A and point called B. 9 00:00:42,260 --> 00:00:54,350 So in order to move at unit a charge from A to B we will need at a voltage or the voltage is the force 10 00:00:54,350 --> 00:00:56,700 which moves our electrons. 11 00:00:56,870 --> 00:01:06,590 So the voltage required from A to B is called the VAB VAB is a force which moves our electron from A 12 00:01:07,340 --> 00:01:18,550 to B so plus minus here means the Aberdeenshire difference or the voltage required or ze war Khaddam 13 00:01:18,670 --> 00:01:30,880 required the to move at George from A to B and devalue or VAB is equal to V A minus VB Z potential of 14 00:01:30,880 --> 00:01:35,070 point A minus is the potential of Point B. 15 00:01:35,110 --> 00:01:36,430 So this is a positive. 16 00:01:36,430 --> 00:01:43,710 This one is a negative so the voltage or potential difference is energy. 17 00:01:43,710 --> 00:01:54,030 So this represents the energy required to move a unit charge from A to B and this voltage is measured 18 00:01:54,030 --> 00:01:56,100 in volts or V 19 00:01:59,250 --> 00:02:04,450 so one volt here means that we need energy to move. 20 00:02:04,470 --> 00:02:13,650 I wanted to charge so it will be energy over or better charge of our charge or better charge the energy. 21 00:02:13,860 --> 00:02:21,840 As you know that energy or work is measured enjoyed or measured in your 10 meter over column which is 22 00:02:21,840 --> 00:02:23,430 the unit to charge. 23 00:02:23,490 --> 00:02:28,860 So the 1 volt gives us one goal to move one column. 24 00:02:31,540 --> 00:02:36,280 Here an example for this we have here a positive minus and a and b. 25 00:02:36,370 --> 00:02:42,100 So in order to move I wanted to charge from a to b. 26 00:02:42,310 --> 00:02:45,130 We need our potential difference of mind Volt. 27 00:02:45,820 --> 00:02:46,800 So here we 28 00:02:49,410 --> 00:02:54,470 minus VB equal mine volt. 29 00:02:55,100 --> 00:03:00,390 OK so a is higher than B by 9 volt. 30 00:03:00,390 --> 00:03:03,180 So again what does the potential mean. 31 00:03:03,180 --> 00:03:11,430 Our potential can be equivalent to pressure OK Z pressure of point day is greater than C pressure of 32 00:03:11,430 --> 00:03:13,970 Point B by 9 volt. 33 00:03:14,040 --> 00:03:21,480 Same as the wind when the moves from one point to another due to the difference in pressure similar 34 00:03:21,480 --> 00:03:30,960 here due to having a higher pressure it moves the electrons or pushes the electrons so rosy an element 35 00:03:31,020 --> 00:03:37,900 as the capacitance the resistance in and whatever to the point to be so. 36 00:03:38,200 --> 00:03:46,460 To simplify this we have as you know that we have year water or a river. 37 00:03:47,110 --> 00:03:47,540 OK. 38 00:03:47,900 --> 00:03:49,970 And this represents point A. 39 00:03:50,180 --> 00:03:51,710 This represents point to me. 40 00:03:52,310 --> 00:03:59,420 So you will find that here the water will flow from the higher level and to the lower level which is 41 00:03:59,430 --> 00:04:08,330 being y due to the presence of height or a difference between Level A and delivery B level and that 42 00:04:08,330 --> 00:04:16,760 it will be a similar to voltage G and voltage B due to a difference in voltage or differences in height 43 00:04:17,120 --> 00:04:26,690 gives us a flow of current or flow of water which is a flow of electrical source but if as we are on 44 00:04:26,690 --> 00:04:37,050 the same level Okay a and b then ze water will be on the same level of crazy will not flow. 45 00:04:37,070 --> 00:04:37,440 Okay. 46 00:04:37,470 --> 00:04:40,790 Not like this from one level to another. 47 00:04:41,200 --> 00:04:48,400 Similar here you will find years at and here if we both hear negative boast of then it means that plus 48 00:04:48,400 --> 00:04:48,910 minus. 49 00:04:48,910 --> 00:04:55,470 It means that we are talking about VB minus V okay. 50 00:04:55,870 --> 00:04:59,560 So we said that here a is greater than B by 9 volt. 51 00:04:59,560 --> 00:05:06,240 So if we subtract B minus A will give us negative mind. 52 00:05:06,400 --> 00:05:09,680 So this is equivalent to this one. 53 00:05:10,360 --> 00:05:15,120 Okay but here positive was a bot here positive was B. 54 00:05:15,220 --> 00:05:15,620 Okay. 55 00:05:16,090 --> 00:05:17,530 So here what does it mean. 56 00:05:17,530 --> 00:05:21,180 Means that positive minus or the potential difference is VBA. 57 00:05:22,450 --> 00:05:24,060 Okay here VAB. 58 00:05:26,890 --> 00:05:31,480 And this one is v B E okay. 59 00:05:31,970 --> 00:05:39,880 So if we would like to know the potential difference VAB is equal to negative VB. 60 00:05:40,050 --> 00:05:40,890 Okay. 61 00:05:41,150 --> 00:05:43,040 Now another example. 62 00:05:43,050 --> 00:05:47,370 Let's see the circuit this circuit having a supply equal 20 Volt. 63 00:05:47,390 --> 00:05:49,530 This is equivalent to a battery. 64 00:05:49,540 --> 00:05:50,280 Okay. 65 00:05:50,660 --> 00:05:54,390 And this produce a current in this direction or 5 and there. 66 00:05:55,250 --> 00:06:04,600 So in order for the charges to move from this point in to this point we need to well revoked okay. 67 00:06:04,820 --> 00:06:07,800 In order to move from here to here. 68 00:06:07,970 --> 00:06:10,760 So all of this are short circuit. 69 00:06:11,120 --> 00:06:13,090 So we have the same voltage. 70 00:06:13,110 --> 00:06:14,840 KS It is no voltage drop. 71 00:06:15,400 --> 00:06:24,650 Okay so until here we have a 20 Volt and this load or this resistance or capacitance or any element 72 00:06:24,790 --> 00:06:26,970 required a twelve volt. 73 00:06:27,020 --> 00:06:29,990 So this point will be 8 74 00:06:33,160 --> 00:06:33,760 volt. 75 00:06:34,570 --> 00:06:35,320 Okay. 76 00:06:35,650 --> 00:06:39,970 So here 20 minus twelve gives us eight Volt. 77 00:06:39,970 --> 00:06:47,470 So in order for the charges to bus from here to here it needs at well volt we call z point which we 78 00:06:47,470 --> 00:06:51,100 are entering year is the positive and leaving negative. 79 00:06:51,100 --> 00:06:56,610 So since this economy is entering year it will be positive and delivering negative. 80 00:06:57,580 --> 00:07:01,720 We call Z twelve revolt the year is called a voltage drop. 81 00:07:01,750 --> 00:07:02,830 Why it is called. 82 00:07:02,840 --> 00:07:05,000 I've also dropped because it is a drop. 83 00:07:05,020 --> 00:07:13,450 We decrease our voltage ze voltage entering is 12th and dropping it causing it the album to be eight 84 00:07:13,510 --> 00:07:14,080 Volt. 85 00:07:14,680 --> 00:07:17,280 So this is the definition of the voltage. 86 00:07:17,290 --> 00:07:20,270 Let's see that definition of energy and power. 7871