1 00:00:01,090 --> 00:00:01,730 Hello. 2 00:00:01,780 --> 00:00:03,650 Today we will talk about middle income. 3 00:00:04,330 --> 00:00:09,650 What is cut on count is the flow of electrons through a conductor. 4 00:00:09,650 --> 00:00:14,980 The water analogy is that current is like the water flowing through a hose. 5 00:00:15,020 --> 00:00:19,030 Count is measured in ambers and show from those. 6 00:00:19,070 --> 00:00:26,900 This illustration when Amber is a large number of electrons flowing past a spot in the conductor and 7 00:00:27,010 --> 00:00:28,410 the conductor in one second. 8 00:00:28,430 --> 00:00:37,400 As you can see in this illustration one Amber equals the number of electrons. 9 00:00:37,400 --> 00:00:39,490 I want to read it in one second. 10 00:00:40,550 --> 00:00:50,680 Um can't in normal electronics can be in the range of hundreds of arms to millions of micros two billionth 11 00:00:50,900 --> 00:00:52,850 of an S Nanos. 12 00:00:53,200 --> 00:01:00,770 You will generally work with 10 tons of amps down to Microsoft's arms in the typical electronic devices. 13 00:01:00,770 --> 00:01:08,570 You can deal with higher value than 10 arms since they require special device for measuring them and 14 00:01:08,570 --> 00:01:16,550 they are mainly used in factories not in everyday electronics or in circuits or common circuits. 15 00:01:16,940 --> 00:01:22,280 So now let's look at current measurements. 16 00:01:22,310 --> 00:01:29,630 There is greatest potential for meter damage when measuring current than any other function. 17 00:01:29,840 --> 00:01:36,840 Just as in voltage there is two kinds of current associated with the voltage AC and DC. 18 00:01:36,890 --> 00:01:44,390 This meter will only measure DC more expensive meter will measure both currents to measure current the 19 00:01:44,390 --> 00:01:51,370 Volt o meter must be inserted into this into the circuit so that the current flows through the meter. 20 00:01:51,530 --> 00:01:57,100 There is no way that you place the positive and negative robs and say I just measured current. 21 00:01:57,260 --> 00:02:03,030 This won't work like voltage you must place it in the circuit not on the circuit. 22 00:02:03,260 --> 00:02:10,750 So we must uh again mention safety during these measurements. 23 00:02:11,090 --> 00:02:23,900 And um we must spend some time to amplify your knowledge in how to use the Volt o meter to measure current. 24 00:02:23,900 --> 00:02:32,810 The right way and we mention that the current must flow through the meter us or both measuring voltage 25 00:02:32,810 --> 00:02:39,380 when it was only necessary to Sam but the voltage surrounding the source generally to have the current 26 00:02:39,380 --> 00:02:47,630 flow through the volt meter an existing circuit must be broken and sold out and the meter probes connected 27 00:02:47,630 --> 00:02:49,680 to either side of the break. 28 00:02:49,820 --> 00:02:57,190 The 4 volt o meter then becomes part of the path through which that comment must flow. 29 00:02:57,240 --> 00:03:04,980 There are two current ranges high up in arms and low and 200 million arms or both two arms and below 30 00:03:05,820 --> 00:03:13,200 internal fuses provide some meta protection for over current situation because there is such a wide 31 00:03:13,200 --> 00:03:15,660 range of current scales. 32 00:03:15,720 --> 00:03:19,830 There are two physical blobs jugs for that oranges. 33 00:03:19,860 --> 00:03:22,120 This allows for better protection. 34 00:03:22,540 --> 00:03:29,790 A hard refused to handle up to the arms of current and a more fragile fuse to protect the sensitive 35 00:03:29,790 --> 00:03:33,780 circuits needed to match up small currents. 36 00:03:33,810 --> 00:03:42,420 Now we will see these two ranges in diameter but we must read that caution. 37 00:03:42,420 --> 00:03:49,020 There must be some resistance in the circuit or the current flow through the circuit will be the maximum 38 00:03:49,590 --> 00:03:54,050 the source will produce and this current level could damage the Volt or meter. 39 00:03:54,540 --> 00:03:57,510 So your Jamal must make sure that there is some resistance. 40 00:03:57,510 --> 00:04:05,670 You must not connect the bolt on Meet up to Mr Khan directly and placed inside the circuit. 41 00:04:05,670 --> 00:04:12,180 In other words do not connect the Volt o meter blobs directly across the battery bro balls in the current 42 00:04:12,240 --> 00:04:13,630 measurement function. 43 00:04:13,650 --> 00:04:17,010 This is useless and it wont. 44 00:04:17,250 --> 00:04:25,110 It will damage your Volt or meter so with no resistance in the circle the voltage source will provide 45 00:04:26,170 --> 00:04:33,010 the full current available to the circuit there is essentially no resistance in the Volt or meter probe 46 00:04:33,010 --> 00:04:33,880 lines. 47 00:04:33,880 --> 00:04:39,460 Therefore if the blobs are connected directly across the battery ball the full current in the battery 48 00:04:39,670 --> 00:04:45,860 will flow through the Volt or meter and wobbly blows a fuse. 49 00:04:46,090 --> 00:04:53,070 So we must make sure that there is some kind of resistance in that circuit. 50 00:04:53,080 --> 00:04:59,130 If the very very isn't your must replace resistance inside that circuit.