LAB 8 PHYS

The work function for the anode is bigger than that of the cathode, resulting in a so-called "contact-potential difference" between the anode and cathode. Its effect is to shift the entire Current vs. Voltage curve (why?). Estimate the contact potential difference. 7

A. Explain the difference between charging current andfaradaic current. B. What is the purpose of waiting 1s after a voltage pulse before measuring current in sampled current voltammetry? C. Why is square wave voltammetry more sensitive than sampled current voltammetry?

A single phase – half wave controlled rectifier with freewheeling diode is supplying a load consistingseries connected a resistor and an inductance from a 70.7V (RMS), 50Hz sinusoidal AC source.The firing delay of the thyristor is 90° and the load values are R=10Ω, L=0.1 H. Define the loadcurrent expression and draw the load current by calculating for first two periods. And calculate theaverage values of the load voltage and current.

A single phase – half wave controlled rectifier with freewheeling diode is supplying a load consistingseries connected a resistor and an inductance from a 70.7V (RMS), 50Hz sinusoidal AC source.The firing delay of the thyristor is 90° and the load values are R=10Ω, L=0.1 H. Define the loadcurrent expression and draw the load current by calculating for first two periods. And calculate theaverage values of the load voltage and current.

Describe the electrochemical double layer capacitor (EDLC) using carbon electrode. please use computer typing in order to be understanble

Please help me

Suppose we have a 10-V-peak sinusoidal voltage source. Draw the diagram of a circuit that clips off the part of the sinusoid above 5 V and below -4 V. The circuit should be composed of ideal diodes, dc voltage sources, and other components as needed. Be sure to label the terminals across which the clipped output waveform vo(t) appears.

This multiple choice questions from electronics lab,please solve all ,it's easy for you ????

What is the purpose of designing bushings as capacitor bushings? Indicate the reason why the ground mounted indoor type post insulators are designed according to which electrode assembly and in which region of the insulator discharge starts first, explain what measures can be taken to increase the discharge voltage in this region.

For the circuit given in Figure-2, let the switch was initially closed at position-1 for a 5T time and then the switch is moved to position-2 and left there. Determine: i. Draw capacitor charging circuit and time constant for charging circuit. ii. Expression for vc and ic while switch is in position-1. iii. Compute vc and ic at t = 1T time while switch is at position-1. iv. Time constant for discharging circuit and draw discharging circuit. v. Expression for vc and ic while switch is at position-2. vi. Compute vc and ic at t = 1T while switch is at position-2. vii. Sketch the voltage and current plot for charging and discharging of capacitor and indicate voltage and currents points on the plot. 10 kΩ ( 15 kN R1 R3 E R2 5 kN E= 200V Figure-2 C= 20.75miyu F

Discussion: 1. Discuss the obtained curves. 2. What are the advantages of using cascade voltage regulater circuit? 3. To stabilize a voltage of 65 V, one can: a. Use one 65V zener diode b. Use ten 6.5 V zener diodes in series If the costs are irrelevant, then which solution is best and why? I R. (A I O Vin v)Vout Figure (5.2) A stabilizer circuit with variable power supply. IL V (V) Vout RL Figure (5.3) A stabilizer çircuit with variable load.

Derive the expressions of voltages across resistor and capacitor and the current through the circuit in charging and discharging phases of an RC circuit excited by DC voltage. Name some uses of transient currents. 2.

In the figure given we have u(t)=10. cosot [V]. We assume the diodes and the A-meter (A) to be ideal. A u(t) a) Plot the waveform of the current flowing through the A-m in scale. b) What is the reading of the A-m, if it is moving-coil type? c) What is the reading of the A-m, if it is moving-iron type? d) Calculate the power factor of the WHOLE structure. R1 1 R2 102

Fill the blanks with suitable following terms (AND gate, Potential Transformers (PT), cathode ray oscilloscope CRO, electronic switch Current Transformers (CT), DC component, cathode ray tube (CRT), AC component, electron.gun. 1.The heart of a ............is the................. the electron beam is generated, accelerated, and deflected in accordance with the input signal. 2. Power measurements in high-voltage high current circuit can be effectively done by the use of...and.. ...in conjunction with conventional wattmeter. 3. The sig ...ose frequency is to be measured is converted into a train of pulses (Using Comparator for example), one pulse for each cycle of the signal and applied continuously to an...A 4. In Average Responding Voltmeter, the AC signal is first applied to the blocking capacitor used at the input to block any..................in the input voltage. 5. Dual Trace Oscilloscope This CRO has a single.....................whose electron beam is split into two by an…

Assume that an input signal is applied to the circuit given above, as shown in the figure next to it. Accordingly, answer the following questions. The diodes used are silicon diodes, their operating voltages are 0.7 volts, and can be omitted because their resistance is very small. a) Write the name of this circuit, thinking about which circuit we do in the courses is equivalent to the purpose. b) What are the diodes/diodes that are active in a positive half-loop? Please type. c) What are the diodes/diodes active in the negative half-loop? Please type. d) Calculate ? ?−???( ?? ) for this circuit.

please answer with written solution. thank you

How do I get to the answers Provided? Can you show in steps? Thank you

Provide 3 sample calculations involving DC circuit under transient current condition on series R-L and Series R-C circuit? Need a simple supplementary explanation, can't quite understand the definitions I have currently.

Make the described voltage multiplier circuit, determine the voltage charge in each capacitor, and the output voltage of the circuit. Plot the output waveform in proper phase alignment with the input voltage. Indicate the peak values with the support of your solutions. Use silicon diodes in your analysis and an input V=10 Vrms. a) Half-wave voltage doubler b.) Full-wave voltage doubler

D1 Vsecondary Vfiltered D2 V1 sine Rload I 120 VAC @ 60 Hz D3 10:1 - D4 Figure 1: Bridge Rectifier Voltage Regulator Circuit The filter capacitor C, is recharged on every half-cycle of V secondary. Given: Rioad = 100 N VDiodes = 0.7 V Vi is given in RMS What is the minimum value of capacitor C, required such that Vrutered does not drop below 8 V?

Q1)Design moving coil ammeter as a voltmeter to read 15 V (RMS) alternating voltage. If the internal resistance of the ammeter is 5 K2, the voltage across the internal resistance is 0.5 v and the resistance of the diodes in the forward direction is 1 K2, find the multiplier resistance and sensitivity. Assume half wave rectification and a shunt resistance across the meter. The value of the shunt resistance across the ammeter is 2.5 KQ. Q2) Re-design the question above for full wave rectifier (without Rsh)

9- In abnormal glow discharge, the voltage at the cathode is... a- increases b- decreases c- stick constant d- not of all above

Given the clamper circuit below, assume that the value of R and C are large enough so the voltage across the capacitor does not change significantly during the interval of time. a.) Using the simplified diode model, simulate the action of the circuit when the diode is in forward and reverse bias condition and measure its output voltage.  b.) Draw the output waveform of the circuit.

solve c and d

Question 3 a) The Fermi level of a solid-state body is the thermodynamic work required to add one electron to the body. The Fermi level does not include the work required to remove the electron from wherever it came from. With the aid of diagram discuss the importance of the Fermi Energy level, especially its relevance to electron flow in a pn-junction diode.     b) Discuss the I/V characteristics curve of a practical Germanium diode and explain in detail how the forward and reverse are achieved. Support your explanation with a suitable circuit diagram with a voltage source and RC components connected across the p-n junction

Cyclic Voltammetry and Charge-discharge The given figure is the Galvanostatic Charge-discharge curves of a supercapacitor made with MnO2 coated on a CNT electrode.  Potential is measured with respect to time by applying different current densities. Based on the plot, answer the following questions   4. Is it possible to estimate maximum power of the device with this charge-discharge curve? If possible, explain how you would do it. (calculation is not necessary)