1 00:00:01,260 --> 00:00:10,539 Hello, I'm going to do one of the compulsory activities we have in this lesson, in this unit, unit 4 2 00:00:10,539 --> 00:00:22,019 ICT activities, electric circuits, here we have two different parts, circuit diagrams and the Ohm's law 3 00:00:22,019 --> 00:00:24,879 I'm going to do one of them 4 00:00:24,879 --> 00:00:38,159 The AMS law refers to the way of connecting a voltmeter in parallel with a resistor and an ammeter here 5 00:00:38,159 --> 00:00:42,159 We need to open the circuit to connect the ammeter 6 00:00:42,159 --> 00:00:48,060 The circuit is this one, the series circuit, paper activity 18 7 00:00:48,060 --> 00:00:53,840 First I'm going to do it without looking at this activity 8 00:00:53,840 --> 00:00:59,679 To connect the voltmeter, we need to use this simulator 9 00:00:59,679 --> 00:01:01,340 So I click here 10 00:01:01,340 --> 00:01:07,280 And now what I have to do is to draw this circuit 11 00:01:07,280 --> 00:01:15,140 The series circuit made up of a battery and three different lamps 12 00:01:15,140 --> 00:01:22,000 Here in the circuit we are going to use this lamp and all the lamps are the same lamp 13 00:01:22,000 --> 00:01:27,120 It doesn't matter in order to know how to connect the voltmeter 14 00:01:27,120 --> 00:01:34,420 So we have this lamp, another lamp, this other lamp 15 00:01:34,420 --> 00:01:38,459 And I need to use wires to complete the circuit 16 00:01:38,459 --> 00:01:44,659 This wire and two more, one and two 17 00:01:44,659 --> 00:01:50,959 So when I switch off, switch on the switch 18 00:01:50,959 --> 00:01:54,859 I see that the lamps are lighting up 19 00:01:54,859 --> 00:01:57,680 Ok, now 20 00:01:57,680 --> 00:02:02,540 what the instructions say is 21 00:02:02,540 --> 00:02:06,540 after drawing the circuit, we need to 22 00:02:06,540 --> 00:02:11,419 use the voltmeter to measure voltage drop across L2 23 00:02:11,419 --> 00:02:15,419 L2, so the voltage drop 24 00:02:15,419 --> 00:02:17,819 between B and C 25 00:02:17,819 --> 00:02:20,939 the second lamp, this lamp 26 00:02:20,939 --> 00:02:25,439 here we have the multimeter, the voltmeter 27 00:02:25,439 --> 00:02:27,639 and meter and everything 28 00:02:27,639 --> 00:02:33,780 so, voltmeter is here, I click here 29 00:02:33,780 --> 00:02:37,780 to measure voltage, and for that 30 00:02:37,780 --> 00:02:41,759 we need to close the circuit, now current is 31 00:02:41,759 --> 00:02:44,620 flowing through the circuit 32 00:02:44,620 --> 00:02:56,379 But if we want to change the voltage, here we have a 6 volt battery, so we can change this value, 6 volts 33 00:02:56,379 --> 00:03:06,060 And now what I have to do is to connect in parallel the voltmeter with this lamp, lamp number 2, this way 34 00:03:06,060 --> 00:03:13,080 Ok, first, I'm going to see if the voltmeter is working 35 00:03:13,080 --> 00:03:31,360 The battery is a 6-volt battery, so I can check this. I connect the probe, this one and two probes, here, and I see that it's working. 36 00:03:31,360 --> 00:03:52,620 So the voltage drop across these two points in the circuit is 6 volts. But what I have to measure is the voltage drop across this lamp. So here and there, 2 volts. 37 00:03:52,620 --> 00:04:04,939 It's clear because, as I said, the lamps are equal, so each of them has a voltage drop of 2 volts. 38 00:04:05,419 --> 00:04:09,039 2 plus 2 plus 2, 6 volts in total. 39 00:04:10,460 --> 00:04:12,080 Okay, thank you.