Physics 2 Lab 2 Ohm's Law Lab

Why are resistors important in an electrical circuit? ) Resistors only allow a current to flow in one direction and can change alternating currents to direct currents. Resistors are electrical components that help to control the flow of the current in a circuit; they restrict the flow of electrons. ) Resistors consist of two pieces of conducting material separated by an insulating material called a dielectric. They are often used as timing devices, but they can transform electrical currents in other ways, too. ) Resistors can switch tiny electric currents on and off or amplify them.

Using what you know

Si is doped with 2x1017 boron (B) atoms/cm³ and 6x1017 phosphorous (P) atoms/cm³. (a) Is this n-type or p-type and why? (b) What are the electron and hole concentrations at 300K? (use ni = 1010 cm³). (c) Calculate resistivity of Si is doped with donor density of Np = 2x1015 (use n¡ = 10!º cm³) and NA = 0 (use n¡ = 1010 ; µn = 1320 cm²/Vs, µp = 460 cm²/Vs) cm (d) In a Germanium semiconductor at T= 250 K (n¡ = 1x1012 cm³), it is found that po = 4no and that Nd = 0. Determine po, no, and Na. (e) Calculate the intrinsic carrier concentrations of these three bandgap materials at 300K: Eg = 1.12eV; and Eg = 0.66eV; where pre-factors are B=1.08x1031 K*.cm3 (1.12eV) and B = 2.31x1030 K³.cm³ (0.66€V).

(d) Calculate the electrical conductivity of a 6.0 mm diameter cylindrical silicon specimen of 60 mm long in which a current of 0.5 A passes in an axial direction. A voltage of 12.5 V is measured across two probes that are separated by 40 mm. i. Compute the electrical conductivity of the specimen. C12334 ii. Compute the resistance over the entire 60 mm of the specimen using the data in (1).

5. Calculate the conductance and the conductivity of a metal if the resistivity of the metal is 2.824 x 108 Q.m, with resistance of 9.0 x 10 Q when current is 1.25 A.

A cylindrical sample of solid germanium has length 55.0 mm and diameter 5.0 mm. In a test circuit, 0.150 A of current flowed through this sample when the voltage applied between its ends was 17.5 V. What is the electricalconductivity of this sample?

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OUTM FINAL EXAMINATION UTM OUTM UTM 60TM PIRAL TM OUTM PIRAL OUTM OUTM "Tos UTM Figure 5 a) Figure 5 showed applications of alloys as roofing materials (Figure 5a) and automotive body parts (Figure 5b). Suggest non-ferrous alloys that could satisfy each application. Justify your selection with the inclusion of comparison for mechanical strength requirements between both applications.

Please answer 1 a, b, and c.

A steel sheet will have a thin layer of zinc put on one side to protect it from corrosion. Determination of the zinc film thickness per one centimeter square of steel sheet when a 2 A current is employed and the electrolytic deposition process is completed in exactly 30 minutes at 25 degrees Celsius. With a 1 M zinc solution, it's safe to presume that its concentration will remain stable throughout the process.

what are intrinsic and extrinsic semi-conductors ?

purification and separation of a mixture

#14: The Cassini spacecraft that visited Saturn and its moons did more than take pretty pictures; it also returned physical data. Saturn’s moon Titan has a substantial atmosphere, and Cassini went close enough to detect atoms and molecules from Titan’s atmosphere. It measured the atmospheric composition with a time-of-flight mass spectrometer. Ionized atoms and molecules were accelerated through a 30 kV potential difference and then sent through a chamber of length 18.8 cm. The time to travel the length of the chamber was measured, with heavier particles taking longer times. What is the travel time for a singly ionized molecule of water?

Aluminum (molar mass = 26.9815 g/mol) is refined from its oxide ore, Al2O3. If the electrical current that is flowing is 750.00 A, how long will it take to deposit 503.36 grams of aluminum? Report your answer in hours with 1 decimal place precision. Your Answer: Your Answer

Oxide coated cathode work function is 1 ev O 1 v O 4.52 ev O 2.6 ev

The passage of a current of 0.750 A for 25.0 min deposited 0.369 g of copper from a 4P—<6 solution. From this information, calculate the molar mass of copper. (Masterton et al., 2012)

Determine the corrosion rate ( mpy ) of steel corresponding to 1µA / cm? of current. Following is the composition of alloys. Cr = 21%, density = 7.1 g/ cm', At.wt. = 52.01 g /mol, number of electron = 1 Ni = 8%, density = 8.9 g/ cm', At.wt. = 58.68 g /mol, number of electron = 2 Fe = 70%, density = 7.86 g/ cm', At.wt. = 55.85 g /mol, number of electron = 2 Note : Faradays constant = 96500 coulombs per mole of electrons. C= constant which includes F and any other conversion factor for unites, for instance, C = 0.129 when corrosion rate is in mpy.

2. The production of hydrogen gas was made at a pressure of 15 psi from the electrolysis of water. The total volume of hydrogen gas produced is 0.004 cubic meter. Electrolysis of water takes place where a current passes through a 7.14 ohm resistor with a voltage of 25 volts for 1.5hrs. Determine the following: a. number of moles of H2 gas b. Temperature condition of the process in °C c. Energy consumed to produce H2 gas.