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Unreasonable Results(a) What current is needed to transmit $1.00 \times 10^{2}$ MW of power at 480 $\mathrm{V}$ ? (b) What power is dissipated by the transmission lines if they have a $1.00-\Omega$ resistance? (c) What is unreasonable about this result? (d) Which assumptions are unreasonable, or which premises are inconsistent?

(a) $I=2.08 \times 10^{5} \mathrm{A}$(b) $P=43.3 \mathrm{GW}$(c) The power dissipated withing the transmission lines is huge. It is even greater than the power output of the transmission lines.(d) The voltage is too low. Such a transmission line in real life would have much higher voltage and low current so that the power dissipated in the line is reduced.

Physics 102 Electricity and Magnetism

Chapter 20

Electric Current, Resistance, and Ohm's Law

Current, Resistance, and Electromotive Force

Rutgers, The State University of New Jersey

University of Michigan - Ann Arbor

McMaster University

Lectures

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in this particular problem, the power to transmit is giving us so we will be judged on the data For others, it is our S B is equal to one in communistic too. Megan, what's which is actually 100 Into tenderness to six words. We can write it the same time. The war dish I didn't realize we is given us 4 80 words Onda we need to calculate Couldn't in Skippy Now since we know that power is equal to I multiplied by me Therefore, in order to calculate current said a show be Chloe that robberies 100 in tow. Generous to six words Look on Wall Day is a foreign rewards. Now the answer between gate is to lack 3 8033.33 amperes, which is really high current and we can convert it and do 2.8 You know, Duke. Then there is 25 beers and this is a first answer. So the coordinated could transmit the power is up 2.8 ingredients to find beers. No, for Steve be the power is separated by the transmission line having resistance off one home. So basically your resistance is giving us one home and we need to capture the power. In this case, we'll use formula. Power is equal to ay square multiplied by resistance. We got a value of current as 2.8 into tennis to five amperes Mike. It glided by one. Often we take the square of current. So I do. That we get is 4.33 in group and is to turn works and this is our second superpower. Reciprocated is off 4.3 300 Grand District in Watts. Moving to step, See no to answer this particular question will buy the statement That is the current value on and the power dissipation already high and on the reasonable and such high values such higher values. You did not trip like the practical use for these quantities. Basically, these are not practical values that we already court and forced that. D you answer this question? Actually, this particular exemption you're right. He does the exemption which is causing the results and bought A and B to be unreasonable. Is that the resistance of power transmission line? He's off on the one and this resume value. Well, Fred, distance is very low, so settle, Oh, value sexually over you. It is not possible and power transmission line, but we need to understand.

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