Download the App!

Get 24/7 study help with the Numerade app for iOS and Android! Enter your email for an invite.

Get the answer to your homework problem.

Try Numerade free for 7 days

Like

Report

Unreasonable Results(a) What current is needed to transmit $1.00 \times 10^{2}$ MW of power at 10.0 $\mathrm{kV} ?$ (b) Find the resistance of 1.00 $\mathrm{km}$ of wire that would cause a 0.0100$\%$ power loss. (c) What is the diameter of a 1.00-km-long copper wire having this resistance? (d) What is unreasonable about these results? (e) Which assumptions are unreasonable, or which premises are inconsistent?

(a) $I=10.0 \mathrm{kA}$(b) $R=1.00 \times 10^{-4} \Omega$(c) $D=0.468 \Omega$(d) The diameter of the wire is unreasonably large. A wire with such a diameter would be too heavy for use.(e) The power loss is extremely low for a transmission line at this voltage. For example, a 160 $\mathrm{km}$ transmission line at 345 $\mathrm{kV}$ (which is much greater than the voltage in our problem) carrying 100 $\mathrm{MW}$ of power can have losses of 4.2$\%$

Physics 102 Electricity and Magnetism

Chapter 20

Electric Current, Resistance, and Ohm's Law

Current, Resistance, and Electromotive Force

Cornell University

University of Michigan - Ann Arbor

Simon Fraser University

University of Sheffield

Lectures

11:53

In physics, a charge is a …

10:30

The electric force is a ph…

05:31

(a) What current is needed…

06:11

Unreasonable Results(a…

01:55

07:04

Unreasonable Results A sur…

06:29

Unreasonable Results An in…

02:24

Unreasonable Results (…

01:46

09:32

01:43

02:17

02:34

Unreasonable ResultsAn…

02:04

Unreasonable ResultsTw…

02:08

02:46

An inventor wants to gener…

04:19

02:13

01:42

00:59

(a) Calculate the electric…

02:27

(a) What is the internal r…

prescription. You're looking at the power disputed by Y us in transmitting power for me. Power generator plant, you know, to typical households. No making Vendetti ho is Tim Tebow. Eat what's right. And the voltage there were transferring. It is 10 to po off. Four oh, for votes. Right. There's 10 kilovolts and a fine. First off current. Just taking a poly. Everybody for teach. It gives us 10 oppose Full MPs. No, we're gonna find What's the resistance that would below us Toe only have 0.1% power loss. This censorship is your point to 1% power loss in one kilometer off wire? No, for one. Can we talk about you? The resistance they told a power loss basically is given S I square are and 50 polo's. And since the only 12 points or 1%. So what is your point? One of 100 times 10 to eat. Leave Saas fee of 10 Power four. And since the current is given to be tenable for EMS, the resistance must be close to ApoE minus four. Now to find what I see Diameter of this wire? No, that resistance. He goes to the resistive ity. What about body length? About Obaidi course sectional area. The length is a really given to be one kilometers. So that's 1000. The resistive et off copper is, uh given s one point six feet. I said, Oh, minus eight oh meters parties by 1000 meters so we can find what is our course. Sexual. You sure I get your 0.1 60 meter square. No, Sumita, it iss a ah cylindrical wire. I saw it's circular so the diameter can't get because Eva is close to pie. Do you want to square? So he is just for a for pie. 50 square words. And so this is all answer for the time. It'll No, this is not very good. Uh, number Their target is way to lunch very, very much. And when it's too large, Minister T, why would be very, very hey v And so the transmission lines would not be able to be hung, uh, in the air. I call buddy. I used to doing right now because they are too heavy to be hung and you would need a lot off a lot of towers in order to support this wires because they're so heavy. And so in order for a more reasonable answer, the current for you need to be smaller if you want to still have the same a power loss. If not, I think the politics is too small to walk towards right. Two. Maybe a 0.1% or 1% power loss is more doable or manageable as compared to 0.1% power loss.

View More Answers From This Book

Find Another Textbook

In physics, a charge is a physical property of matter that causes it to expe…

The electric force is a physical force exerted by electrically charged parti…

(a) What current is needed to transmit $1.00 \times 10^{2} \mathrm{MW}$ of p…

Unreasonable Results(a) What current is needed to transmit $1.00 \times …

Unreasonable Results A surveyor 100 $\mathrm{m}$ from a long straight 200 $\…

Unreasonable Results An inventor wants to generate $120-$ V power by moving …

Unreasonable Results (a) Calculate the electric field strength near a 10…

Unreasonable Results(a) What is the internal resistance of a 1.54-V dry …

Unreasonable Results(a) To what temperature must you raise a resistor ma…

Unreasonable Results(a) Calculate the capacitance needed to get an $R C$…

Unreasonable Results(a) Find the voltage near a 10.0 cm diameter metal s…

Unreasonable Results(a) What resistance would you put in parallel with a…

Unreasonable ResultsAn $L C$ circuit containing a $1.00-$ pF capacitor o…

Unreasonable ResultsTwo resistors, one having a resistance of 900 $\math…

Unreasonable Results(a) What voltage must be applied to an X-ray tube to…

An inventor wants to generate 120-V power by moving a 1.00-m-long wire perpe…

Unreasonable Results(a) A certain parallel plate capacitor has plates of…

Unreasonable Results(a) What is the binding energy of electrons to a mat…

Unreasonable ResultsTwo resistors, one having a resistance of $145 \Omeg…

(a) Calculate the electric field strength near a $10.0 \mathrm{cm}$ diameter…

(a) What is the internal resistance of a $1.54-\mathrm{V}$ dry cell that sup…

03:57

The naturally occurring charge on the ground on a fine day out in the open c…

00:54

(a) A nonferrous screwdriver is being used in a 2.00 $\mathrm{T}$ magnetic f…

01:57

A short circuit to the grounded metal case of an appliance occurs as shown i…

02:49

Construct Your Own Problem Consider identical spherical conducting space…

Suppose a person has a 50-dB hearing loss at all frequencies. By how many fa…

02:06

During a circus act, an elderly performer thrills the crowd by catching a ca…

01:32

At what speed must the sliding rod in Figure 23.11 move to produce an emf of…

01:10

Military aircraft use 400-Hz AC power, because it is possible to design ligh…

05:55

A very large, superconducting solenoid such as one used in MRI scans, stores…