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- A close analogy exists between the flow of energy by heat because of a temperature difference (see Section 19.6) and the flow of electric charge because of a potential difference. In a metal, energy dQ and electrical charge dq are both transported by free electrons. Consequently, a good electrical conductor is usually a good thermal conductor as well. Consider a thin conducting slab of thickness dx, area A, and electrical conductivity , with a potential difference dV between opposite faces. (a) Show that the current I = dq/dt is given by the equation on the left: ChargeconductionThermalconductiondqdt=A|dVdx|dQdt=kA|dTdx| In the analogous thermal conduction equation on the right (Eq. 19.17), the rate dQ/dt of energy flow by heat (in SI units of joules per second) is due to a temperature gradient dT/dx in a material of thermal conductivity k. (b) State analogous rules relating the direction of the electric current to the change in potential and relating the direction of energy flow to the change in temperature.3. For a Si bar of length 5um, doped n-type at 3x10¹ cm³, calculate the current density for an applied field of 3V across its length. Then do the same for a voltage of 3200V. You can assume that the electron and hole mobilities are 1500 and 500 cm²/V.s, respectively, in the ohmic region below 10¹V/cm and. For higher fields, both electrons and holes have a saturation velocity of 107cm/s.Q4) Attempt to answer ONE branch only: a) If the electron concentration increase along the x-axis of a conductor as shown in equation below: n = 3 + 1030x² + 2 + 1028x + 1026 And D = 1.2 x 10-ª m² /s. Find the diffusion current at x = 5mm?
- 6. (a)Use voltage division to determine the voltage vo across the 400resistor. (b)Use ve from part (a) to determine the current through the 4002resistor, and use this voltage and current division to calculate the current in the 3002resistor. 60 V 400 www +% Dov 200 70 (2 www 30023 5002 w 1002A 12.0 µF capacitor is charged to a potential of 50.0 V and then discharged through a 175 Qresistor. How long does it take the capacitor to lose half of its charge? Select one: t%3D1.46 ms t = 5.00 ms t%3D0.87ms t%34.36ms None of these is correct Next pagSoru 15 Make a junction with given materials to have ohmic contact and give the electrical property of junction. i) Al ii) Au i) p type Semiconductor with Ps=4 V iv) p type Semiconductor with Ps=4.5 V v) p type Semiconductor with Os=5.5 V O a. i or ii-v, linear resistance O b. i or ii -ii, rectifying O c. i or ii -ii, linear resistance O d. ior ii-iv ,rectifying O e. i or ii-iv, linear resistance O f. i or ii-v, rectifying 210703141750-22397 Önceki sayfa
- Conduc-Thor-s. Thor has two square prism conductors that are made of the same ohmic material and with properties indicated below. Conductor Length | Cross-Section Side Length Alpha L Beta L/2 s/4 Suppose both conductors are subject to the same potential difference AV across their length while keeping their temperatures fixed. Which of the following is the correct relation between the electric currents, Ia and IB, through Alpha and Beta? O A. Ia = 8IB O B. 8Ia = Ig O. Ia = 4I8 O D. 4Ig = Ig Clear my choiceMetals are bonded by metallic bond, that is protons in a sea of electrons which give them their characteristic conductivity. If the electric current flows from one end to the other end using a copper wire to bridge the gap, the extra electron given through the electric current will cause the sea of electrons in the copper to? A. The electrons given will just be deposited in the sea of electrons with nowhere to go B. The electrons given will occupy the space of the electrons that were pushed. C. The electrons given will not flow to the metal because of repulsion. D. The electrons given will travel to the other end through the proton movement.3. For a p-n junction with a built-in potential of 0.62 V a) What is the potential across the depletion region at an applied voltage, Va, of 0, 0.5 and -2 Volt? b) If the depletion layer is 1 micrometer at Va = 0 Volt, find the maximum electric field in the depletion region.
- A copper wire is 10 cm long and has a cross-sectional area of 0.4 mm^2 and the resistance of the wire is 0.4 ohms. The wire is connected to a source with a voltage of 10 v, what is the movement, knowing that the density of conduction electrons for copper is 8.5 x 10^28 m^-3 8.5 x 10^4 63-5 For the same wire in the previous question, what is the fersi level if the atomic weight of copper is 0.5 x 10^(-5) 0.94 x 10^(-4) 7.03| ev 0.36 x 10^(-4) 7.01eV 7.05 eV 7.021 evExplain in not more or less than 5 sentences. 1. For each of the following situations, identify which point is at a higher potential,and indicate the direction of the conventional current (whether A B or B to A):a) point A is at +25 V and point B is at +20 V b) point A is at -15 V and B at -8 V 2. Enumerate the condition(s) for a PN junction to:a) block current b) pass currentA simple DC circuit experiment is conducted using a circuit diagram shown below: 26 v 3 mA R R (Indiabix technologies, 2021) In the figure above, two same unknown standard resistor R is connected in the circuit . The voltmeter and ammeter are connected to the circuit as shown above. a) Calculate the unknown resistance of the resistor used in the circuit. b) If we increase the voltage to 40 V, calculate the current measured by the ammeter. | c) Using the data from the above experiment, a graph is plotted between voltage along the Y axis and current along the X axis as shown below:
