Concept explainers
The following graph shows the relationship between current and voltage in a 1 N4148 small signal diode (a semiconductor device that allows current to flow in one direction but not the other).
Semiconductor diodes can be characterized by the Shockley equation:
Where
lDis the diode current [amperes]
10 is the reverse saturation current, constant for any specific diode
q is the charge on a single electron, 1.602 x 1 o-19 coulombs
VD is the voltage across the diode [volts]
n is the emission coefficient, having a numerical value typically between 1 and 2, and constant for any specific device.
k is Boltzmann's constant, 1.381 x 10-23 joules per kelvin
T is the temperature of the device [kelvin]
- a. What are the units of the 1 following the exponential term? Justify your answer.
- b. If the device temperature is 100 degrees Fahrenheit, what are the units of the emission coefficient, n, and what is its numerical value? (Hint: Electrical power [W] equals a volt times an ampere: P = VI. One ampere equals one coulomb per second.)
- c. What is the numerical value and units of the reverse saturation current, 10? Use an appropriate metric prefix in your final answer.
Want to see the full answer?
Check out a sample textbook solutionChapter 12 Solutions
Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
Additional Engineering Textbook Solutions
Vector Mechanics for Engineers: Statics
Vector Mechanics for Engineers: Dynamics
Statics and Mechanics of Materials (5th Edition)
Mechanics of Materials
Heat and Mass Transfer: Fundamentals and Applications
Machine Tool Practices (10th Edition)
- Question 1 The graph below shows the electrical conductivity of some elements from the periodic table. Antimony Carbon Ruthenium Copper Silver 0. 20 40 60 80 Electrical conductivity (x10° S/m) 1.1. With the aid of a clearly labelled graph, describe the effect of temperature on the electrical conductivity of copper and antimony. сopper 1.2. Explain the difference in the electrical conductivity of ruthenium and antinomy. 1.3. Adding small quantities of boron may increase the electrical conductivity of antimony. With the aid of a labelled diagram, explain how this is possible. Besides lower electrical conductivity, suggest a reason why ruthenium is not used in electrical transmission wires. Give a detailed response. 1.4.arrow_forwardSecond m oment of area of a section: With respect to the x axis: I [[ v²dxdy D 8. A plate is bounded by the positive x and y axes and the curve y=3-\x . Find the second moment of area of the plate with respect to the x-axis. [ANS : 8.1]arrow_forwarda) Sydney tap-water has a fluid electrical conductivity (EC or σ) of approximately 210μS/cm. Express this in terms of Ohm metres (resistivity) and mS/m (conductivity). b) The fluid electrical conductivity (EC) was measured on a water sample first at 25 °C to 305 μS/cm, then later at 20 °C to 272 μS/cm. Assuming a linear relationship, calculate the EC at 10 and 30 °C. c) A 20 cm long cylinder with 10 cm diameter is filled with an undisturbed fully saturated sandstone core. A current (I) of 100 mA was passed through the cylinder and a voltage(V) of 10,700 V was measured. Calculate the resistance and the resistivity of the sample. d) If we further know that the porosity is 1%, can you estimate the fluid electrical conductivity?arrow_forward
- 3. Honeywell CRS FR NAV 1 57 NM 20 F 10 - 10 M • 10 - 10 015 S 330 200 DH 200 RA 33 0 03 DH Fig. Q3 (a) Refer to Figure Q3 above. State the type of display shown and explain when it would be used. (b) Identify 5 pieces of information you are able to derive from the electronic display shown above. 20 •arrow_forwardA mechanic changing a tire rolls a wheel along the ground towards the car. The radius of the wheel is 42cm, and the speed of the wheel as it rolls is 2 revolutions per second. Height Above Ground (m) radiu HIDE wheel spet Time The diagram above illustrates the vertical motion of a point on the tire over time. It is possible to model the height of this point using a sinusoidal function of the form h(t)=-a sin[b(t-c)]+d. a) Determine the length of time required for one revolution of the tire. b) State the numerical value for each of the parameters a, b, c & d. And write a function representing the motion of the point in the form h(t)= -a sin[b(t−c)]+d.arrow_forwardVibrations Engineering: A rope of a pendulum has a length of 2 meters. What is the natural frequency of the system for small angles in hertz? (Express the final answer in 4 significant digits)arrow_forward
- 5@students.liu.edu.lb? Switch account 1ON 15 MCQS A standing wave on a string of length L = 3 m is described by the following equation: y(x,t) = 0.08 sin(2Ttx) cos(300Tt). The fundamental frequency, f1, is: %3D 25 Hz 150 Hz 50 Hz 300 Hz 75 Hz The left end of a taut string of length L, is connected to a vibrator with a fixed frequency f. The right end of the string is tied to a suspended object of varyingarrow_forwardThe rate of heat flow equation is Q O A. Thermal resistance OB. Thermal coefficient O C. None of these OD. Thermal conductivity Type here to search KA(T₁-T₂) X E The term X ΚΑ is known as 99+arrow_forwardUsing the data in Table 18.1, (a) calculate the resistance of an aluminum wire with 5 mm diameter and 5 m length. (b) What is the current flow if the potential drop across the ends of the wire is 0.04 V? Table 18.1 Room-Temperature Electrical Conductivities for Nine Common Metals and Alloys Electrical Conductivity [(N-m)-'] Metal 6.8 × 107 6.0 × 107 4.3 × 107 3.8 × 107 1.6 × 107 1.0 × 107 0.94 × 107 0.6 × 107 0.2 × 107 Silver Copper Gold Aluminum Brass (70Cu–30ZN) Iron Platinum Plain carbon steel Stainless steelarrow_forward
- If a spring with elastic constant k [N/m] is deformed at distance x [m], then its potential energy is:arrow_forwardPartII Say you've deployed a robot that can can measure electric field due to specified charge at the specified location with good accuracy. And you got these results from the robot: Electric field due to q2 at point p1 is (-1667.0) i + (18340.0) j Electric field due to q3 at point p1 is (-2496.0) i + (–1628.0) j Electric field due to q1 at point p2 is (-6311.0) î + (2470.0) } Electric field due to q2 at point p2 is (-11585.0) î + (–6951.0) ĵ Electric field due to q3 at point p2 is (4657.0) î + (11310.0) } c) Find the net Electric field at pj .arrow_forwardA mass attached to a spring, set in a container of molasses (a thick liquid) acts like a damped simple harmonic oscillator. The mass is 64 kg, the spring has a spring constant of 9 N/m and the molasses provides a damping force of 48 N. s/m. (a) The system is (A) underdamped (B) overdamped (C) critically damped (b) A force of F(t) -2e-3t/8 (in N) is applied to the mass. If the method of undetermined coefficients is used to find a particular solution, which of the following is the best choice as a trial solution? (c) Initially, at t = 0s, our mass is moving at a speed of 5 m/s as it passes through its equilibrium position (x = 0m). If we are still under the force from part (b), at what positive time, in seconds, does it again pass through x = 0m? (If it never does, type dne).arrow_forward
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY