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A variable dc power supply having reversible polarity is connected to a diode having a $p - n$ junction as shown in Figure 29.28 Starting with the power supply's polarity as shown in gradually decreased to zero gradually decreased to zero and then gradually increased in the reverse direction. (a) Sketch a graph of the reading in the ammeter as a function of the potential difference $V$ across the power supply. Make sign differences clear. (b) Suppose now that the terminals of the diode are reversed and the same procedure is followed. Sketch a graph of the reading in the ammeter as a function of the potential difference $V$ across the power supply. Make sign differences clear. (c) Suppose now that the diode is replaced by an ordinary resistor and the same procedure is followed. Sketch a graph of the reading in the ammeter as a function of the potential difference $V$ across the power supply. Make sign differences clear. (d) Explain the reasons for the differences between the graphsin (i) parts (a) and (b), (ii) parts (a) and (c).
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Atoms, Molecules, and Solids
University of Winnipeg
Atomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus. It is primarily concerned with the arrangement of electrons around the nucleus and the processes by which these arrangements change. The theory of quantum mechanics, a set of mathematical rules that describe the behaviour of matter and its interactions, provides a good model for the description of atomic structure and properties.
In physics, nuclear physics is the field of physics that studies the constituents and interactions of atomic nuclei. The most commonly known applications of nuclear physics are nuclear power generation and nuclear weapons technology, but the research has provided application in many fields, including those in nuclear medicine and magnetic resonance imaging, ion implantation in materials engineering, and radiocarbon dating in geology and archaeology.
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I'm just going to jump into part ay for 26 because I'll assume you have read the rest. But we want to start out by sketching a graph, which is always a good idea to get an idea for the physics of the situation. And we're going to be sketching a graph of the AM eater as a function of the potential difference the voltage across the power supply. So the current versus voltage graph for our different see like this. So for part a in ah, the situation that we have like in the configuration shown you're going to get something like this, you have a negative voltage zero. There's a crossing point and then we increase like this. So you have that, Ah, saturation current at negative voltage is going there in the opposite direction. But then Part B asks for the situation when the terminals of the daio to reversed and the same procedures followed. So look at the am eater, the function of voltage across the power supply. Well, it is quite a bit different now because you have switched the ah polarity of the dye Oda. So now it's almost just the inverse of that one some saturation here. So it goes off to infinity in the negative way. So you see the similarity between this one and this one? There's just sort of like flipped, I guess. But part See, we want to just take dialled out, put in a normal resistor and do the same thing. Now this one is a lot easier because the resistor has no dimensional component to it doesn't matter which way it's flowing. Oh, enough in a bad boy. Lets some replace this here every label or graphs always very important. So your sister just moves linearly because these eagle eye are so you can always obtain just nice straight lines for autographs and then finally, four part D we want to explain. The difference is for all of these Well, it's not too bad. We will try to do it on this page so that we have something that looked forward like look at. But if we have to switch them, we can s O for I. We want to explain between part A and B So in one case, the positive voltage is Ford bias for the diary, which gives a large positive current so that's this one here. So whenever you're in the positive altered Rasheen, your current goes up and up and up and up. But then, for this one, it's the opposite because the negative voltage is Ford bias for the dye out and gives the large native current. But in each case it is going to be the same distant or the same direction as the voltage. So either positive or native for B. So there we go, I said Some warrants for two. We want to explain between A and C now this little, little more clear, I guess, because the resistor there is no Ford or reverse biased direction. It is all linear. If you go to the negative voltage, you get a negative current and future positive alters. You get a positive current. So there's no ah, limiting bias voltage that gives you these trailing off current voltage grass
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