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The following measurements of current and potential difference were made on a resistor constructed of Nichrome $^{\mathrm{TM}}$ wire, where $V_{a b}$ is the potential difference across the wire and $I$ is the current through it:$$\begin{array}{ccccc}{I(\mathrm{A})} & {0.50} & {1.00} & {2.00} & {4.00} \\ {V_{a b}(\mathrm{V})} & {1.94} & {3.88} & {7.76} & {15.52}\end{array}$$(a) Graph $V_{a b}$ as a function of $I .$ (b) Does Ohm's law apply to Nichromet"y? How can you tell? (c) What is the resistance of the resistor in ohms?

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$(\mathrm{c}) 3.88 \Omega$

Physics 102 Electricity and Magnetism

Chapter 19

Current, Resistance, and Direct-Current Circuit

Electric Charge and Electric Field

Gauss's Law

Electric Potential

Capacitance and Dielectrics

Current, Resistance, and Electromotive Force

Direct-Current Circuits

Electromagnetic Induction

Cornell University

University of Michigan - Ann Arbor

University of Winnipeg

Lectures

10:31

A capacitor is a passive two-terminal electrical component that stores electrical energy in an electric field. The effect of a capacitor is known as capacitance. The electrical charge stored in a capacitor is proportional to the potential difference between its terminals. A capacitor is defined as an electrical component that can store an electric charge. The effect of a capacitor is known as capacitance. The charge on a capacitor is directly proportional to the potential difference across its terminals. The unit of capacitance in the International System of Units (SI) is the farad (F), defined as one coulomb per volt. In electrical engineering, a common symbol for capacitance is the lowercase Greek letter "rho" (?). The capacitance of a capacitor is also expressed in farads.

18:38

In physics, electric flux is a measure of the quantity of electric charge passing through a surface. It is used in the study of electromagnetic radiation. The SI unit of electric flux is the weber (symbol: Wb). The electric flux through a surface is calculated by dividing the electric charge passing through the surface by the area of the surface, and multiplying by the permittivity of free space (the permittivity of vacuum is used in the case of a vacuum). The electric flux through a closed surface is zero, by Gauss's law.

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The following measurements…

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The voltage drop $V_{ab}$ …

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The voltage drop $V_{a b}$…

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Shows a resistor of resist…

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In an experiment, the curr…

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The values of current $I$ …

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In a laboratory experiment…

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a. What is the potential d…

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The graph below represents…

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A potential difference of …

and this question, we are given the voltage on current values for micro wire. I'm not no down the points again, but provide a let's draw a graph. You would do this on a crafty and hence it would be much more, much better on more formal. I'm trying it roughly to scare. Now let's finish drawing a graph scale first. Now we want to draw a graph ofthe V vs so that when we did the slope we buy, tell Dobby build, I would be our assistance. No, we need to choose proper. Yet we know that all data the voltage goes from Syria. The current goes from 0.5 ampere 24 ampere on the whole discourse from 1.94 for 15 0.5 Do. Let's track down the rest of them do. It's one ampere and two amperes on the Although it has been 3.8 and 7.76 now, it's an important skill to choose your unit's properly when you draw any glass, as you see that the current goes from 0.5 before a proper unit charge would be 012 and three and four, whereas for hold it because it calls from almost to toe almost 16 properly. Choice would be 16 12 84 and zero. This way all of her points will be within this. Great. Now the units here, our world on the messier amperes. Mind you, mother, you know this was simply we simply dirty points now for syrup on five ampere which is about here We see that the voltage is almost fooled. Just have off this grid Hence this is almost a point when you do it, Ana gas it or even better on the computer. This will be much better and more exact. Let's use a different color. This is our first point now for second point. It is at one AM Pierre. It's almost fore ward, which is this for the third point at two AM peers, it is almost eight fold. So it's almost here. And for the last point, it is that at four AM Pierre, it's almost 16 world which is almost here. I was there a line through it are even better. Do it with a scale on a graph or do a fit on a computer. It will be much better, but you can see that they're almost on a straight line, which takes us to the second part. It looks like it always the onslaught. A better way to take it is to find out we to buy even aunt compare it with a two by one. Now if we equal toe I r on our physical Toby by eye, then for the same resistance we expect we buy I to be the same on. Hence we expect we to buy everyone to be equal toe. Edouard, I won and we can see the 3.84 by 1.4 is too, which is the same as one by 0.5 and two boys are upon five is four, which is the same as 7.76 by 1.9 for and it is eight for the last case on. If you do a fit on a computer, you'll see that all of the line, all of the points, like exactly on the straight line off your friends, which is how you know the onslaught is obeyed in this case Now for party, we want to find the resistance cells, which is simply Delta V vital that I so we can simply take the lot. The first data data point with the last data point. Dobby is 15.52 World minus 1.9 forward, divided by Hilda is for ampere minus 0.5 ampere which stands out away 3.88 Oh!

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