212 lines
4.9 KiB
Plaintext
212 lines
4.9 KiB
Plaintext
{
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0,
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"text": [
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"SPEAKER 1: So I want to show\nyou a simple circuit that",
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"looks like this.",
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"And let's go ahead and measure\nsome voltages and currents.",
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"In terms of terminology,\nremember",
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"this is called a loop.",
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"So if I start from the point\nC, and I travel through the",
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"voltage source, come to the node\nA, down through R1 and",
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"all the way down through R2\nback to C, that's a loop.",
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"Similarly, this point A is a\nnode where the register R1,",
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"the voltage source V0 and\nR4 are connected.",
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"Just make sure your terminology\nis correct.",
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"So what I'll do is let me make\nsome quick measurements for",
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"you, and show you that these KVL\nand KCL are indeed true.",
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"So the circuit's up there.",
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"So let me take some\nmeasurements.",
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"And why don't you write down\nwhat I measure on the board.",
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null,
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"Let me borrow another\npiece of chalk here.",
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"What I'll do is focus on this\nloop here and focus on this",
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"node and make some\nmeasurements.",
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"So you see the circuit\nup there.",
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"[INAUDIBLE]",
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null,
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"So I get three volts for the\nvoltage from C to A. So why",
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"don't you write down\nthree volts.",
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null,
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"OK, so the next one\nis minus 1.6.",
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null,
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"And so that will be\nI'm doing AB, VAB.",
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null,
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"And then let me do\nthe last one.",
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"And it is minus 1.37.",
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"Within the bonds of experimental\nerror, notice",
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"that if I add up these\nthree voltages, they",
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"nicely sum up to zero.",
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"OK, next let me focus\non this node here.",
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"And at this node, let\nme go ahead and",
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"measure some currents.",
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null,
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"What I'll do now is change to an\nAC voltage so that I can go",
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"ahead and measure the current\nwithout breaking my circuit.",
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"This time around, you'll get to\nsee the measurements that",
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"I'm taking as well.",
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"What I have here is three wires\nthat I have pulled out",
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"from D. And this is the node D.\nSo three wires coming into",
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"the node D just to make it a\nlittle bit easier for me to",
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"measure stuff.",
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"So everybody keep your fingers\ncrossed so I don't",
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"look like a fool here.",
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"Hope this works out.",
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"So it's about 10 millivolts\npeak to peak out there.",
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"Let's say that if the wave form\nrises on the left hand",
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"side, it's positive.",
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"So it's positive\n10 millivolts.",
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"And another positive\n10 millivolts.",
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"So that's 20 millivolts.",
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"And this time it's a negative,\nroughly 20, I",
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"guess, negative 20.",
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"So I'm getting, in terms of\ncurrents, I have a positive",
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"10, a positive 10 and a negative\n20 that adds up to 0.",
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"But more interestingly, I can\nshow you the same thing by",
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"holding this current\nmeasuring probe",
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"directly across that node.",
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"And notice that the net current\nthat is entering into",
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"this node here is zero.",
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"So that should just show you\nthat KCL does indeed hold in",
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"practice, and it is not just a\nfigment of our imaginations.",
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null
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]
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} |