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- If you wish to decrease the amount of current in a resistor from 240mA to 180mA by changing the 24V source, what should be the new voltage setting be?What is the difference between faradaic and charging current?Knowing that an electroplating industry wants to coat a steel sheet with a layer of metallic Cu by an electrodeposition process, what is the time to deposit a 50 μm layer on a 10 cm2 plate applying a current density of 30 mA /cm2 if process efficiency is 75%.
- When 5.1 V battery is connected to 101cm wire having cross sectional area (2.34 x 10 m?) current of 0.48 is produced, what is the resistivity (2.m): (A) 10.625 (B) 2.46 x 109 (C) 2.46x 107 (D) 2.49 x 10-7 (E) 10.2Determine the molar mass (amu) of Metal (M) if it took 2.35 minutes for a current of 1.06 A to plate 0.0807 g of metal from a solution containing M2(SO4)3. Input values only with 2 decimal placesThe purity of a sample of K3Fe(CN)6 is determined using hydrodynamic voltammetry at a glassy carbon electrode. The following data were obtained for a set of calibration standards. A sample of impure K3Fe(CN)6 is prepared for analysis by diluting a 0.264 g portion to volume in a 100 mL volumetric flask. The limiting current for the sample is 444 μA. a) What type of calibration method is used? (Internal Standard, External Standard, or Standard Addition?) b) What is the purity of this sample of K3Fe(CN)6 (FW=329.25 g/mol)?
- The exchange-current density for a Pt|Fe3+,Fe2+ electrode is 2.5 mA cm−2. The standard potential of the electrode is +0.77 V. Derive an expression for the current flowing through an electrode of surface area 1.0 cm2 as a function of the potential applied to the electrode; assume standard conditions.2) Name the advantages of glass electrode in potentiometric measurements (please write correctly and concisely).The Weibull distribution is widely used in statistical problems relating to aging of solid insulating materials subjected to aging and stress. Use this distribution as a model for time (in hours) to failure of solid insulating specimens subjected to AC voltage. The values of the parameters depend on the voltage and temperature; suppose ? = 2.2 and ? = 220. (a) What is the probability that a specimen's lifetime is at most 250? Less than 250? More than 300? (Round your answers to five decimal places.) at most 250 less than 250more than 300 (b) What is the probability that a specimen's lifetime is between 100 and 250? (Round your answer to four decimal places.) (c) What value (in hr) is such that exactly 50% of all specimens have lifetimes exceeding that value? (Round your answer to three decimal places.) hr
- A typical exchange-current density, that for H+ discharge at platinum, is 0.79 mA cm−2 at 25 °C. Use the Butler–Volmer equation to calculate the current density at an electrode when its overpotential is (a) 10 mV, (b) 100 mV, (c) −5.0 V. Take α = 0.5.An atomic beam is designed to function with (a) cadmium, (b) mercury. The source is an oven maintained at 380K with a small slit of dimensions 1.0cm x 1.0 x 10-3cm. The vapor pressure of cadmium is 0.13 Pa nd that of mercury is 12 Pa at this temperature. What is the atomic current (the number of atoms per second) in the beams?Which unit is used to measure the magnitude of electricalcurrent? Which unit is used to measure the magnitude of apotential difference? Explain how electrical current and potentialdifference differ.
