Question: An electric adaptor for a notebook computer (converting 110 volts to 19 volts) operates 10oC warmer than the surroundings, which is at 20. If the

An electric adaptor for a notebook computer (converting 110 volts to 19 volts) operates 10oC warmer than the surroundings, which is at 20. If the output current is measured at 3 amps and heat is lost from the adapter at a rate of 10 W, determine
(a) The energetic efficiency of the device.
(b) The rate of internal entropy generation.
(c) The rate of external entropy generation.

Step by Step Solution

★★★★★

3.43 Rating (162 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

a The energy balance equation ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

861-ME-T (6913).docx

120 KBs Word File

Students Have Also Explored These Related Mechanical Engineering Questions!

An electric adapter for a notebook computer (converting 110 volts to 19 volts) operates 10oC warmer than the surrounding temperature. Determine the sign (positive: 1; negative: -1; none: 0) of (a)...

A cylinder with a movable piston contains n moles of gas at a temperature higher than that of the surrounding environment. An external force on the piston keeps the pressure constant while the gas...

An electric bulb consumes 500 W of electricity at steady state. The outer surface of the bulb is warmer than the surrounding atmosphere by 75oC. If the atmospheric temperature is 300 K, determine (a)...

4. Read the following extract from the instructions supplied with a small electronic pocket calculator and answer the questions below it. No special knowledge is required. Keep your answers brief....

Q4. The Portable Garage Co (PGC) is a company specialising in the manufacture and sale of a range of products for motorists. It is split into two divisions: the battery division (Division B) and the...

Under the current transfer pricing system, prepare a profit statement showing the profit for each of the divisions and for The Mechanic Co as a whole. Your sales and costs figures should be split...

Case Study Details Background: You work for Harrow Manufacturing Company (HMC) and are the Central Division Senior Director; you are based in HMCs Winnipeg office. You report directly to Layla...

The following scenario relates to three requirements. The Portable Garage Co (PGC) is a company specialising in the manufacture and sale of a range of products for motorists. It is split into two...

PLANEACION DECISIONES FINANCIERA Y ADMINISTRATIVAS CASO GUIA #3 CSP is a company specializing in the manufacture and sale of products for bicycles. It is split into two divisions: The Basic division...

Letter Submission #1 Assignment Value: 8% Letter Case Study Submission #1 is an individual assignment. That is, you are not permitted to collaborate with other students in preparing any part or parts...

A small bar magnet has a magnetic moment I?B that makes an angle ??with the x?axis and lies in a nonuniform magnetic field given by B = B x (x)i + B y (y)j. Use F x = ? dU/dx?and F y = ? dU/dy to...

5. There are 3 twenty-dollar bills, 6 ten-dollar bills, and 9 five-dollar bills in a box. Suppose a game is played in which a bill is randomly taken from the box, replaced, and then a second bill is...

1 . We have a computer where a word is just 5 bits long. Now, you have to do the following arithmetic: a ) ( - 9 ) - 5 b ) ( - 1 2 ) + ( - 5 ) All decimal, and all in two's complement. Can you show...

Express the function in the form f 8 t 8 h. Hsxd s8 2 1 |x |

Refrigerant-134a at 320 kPa and 40°C undergoes an isothermal process in a closed system until its quality is 45 percent. On per unit mass basis, determine how much work and heat transfer are...

A 0.5-m3 rigid tank contains refrigerant-134a initially at 200 kPa and 40 percent quality. Heat is transferred now to the refrigerant from a source at 35C until the pressure rises to 400 kPa....

Reconsider Prob. 7-42. Using EES (or other) software, investigate the effects of the source temperature and final pressure on the total entropy change for the process. Let the source temperature vary...

Big Bad Bank has issued a 2-year certificate of deposit and a 2-year note. Which should have the higher yield? O a) the deposit b) the note O c) should be equal O Question 13 2 pts General Electric...

At Louiss Discount Furniture Store, Louis, the owner, marks furniture at three times his wholesale cost plus $100. If you bargain with him, hell drop the price as much as 15%. Create a worksheet that...

Q.6.3 Homework Unanswered. Due Today, 11:59 PM What is the annual yield to maturity, to the nearest 0.01%, of a $1,000 par bond with 4.5 years to maturity, 3.5% coupon rate, and semiannual payments...