Virtual Lab Capacitancebbnnnnnn

For direct current (dc), a capacitor acts like (a) a closed switch. (b) an open. (c) a short. (d) a small resistance.

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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?

v.   What is the purpose of a capacitor in electronic circuits?

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?

A-How temperature affects the conductivity of conductive metals and how it affects semiconductors.semiconductors B-What is superconductivity, how does it relate to temperature? Some examples of superconductors.superconductors.

Describe how a capacitor can be used in a DC circuit to store charge /turn on a lightbulb without needing an active voltage source.

The specific capacitance in F/g can be estimated by using both cyclic voltammetry curves atdifferent voltage scan rate and Galvanostatic charge-discharge curves. The following graphshows the charge-discharge curves of a typical MnO2 pseudocapacitive electrode. There is acharge drop in the voltage at the onset of the discharge curve (one such drop is denoted bydeltaV2). What is the reason behind it?

Describe what coupling capacitors are and what are they for?

Q5/B: A three units string insulator is fitted with guard ring around the button insulator. The capacitances of the link pins capacitance. Find the voltage distribution across each unit of string and string efficiency.

8. Liquids with solid impurities a) Have higher dielectrie strength b) Of large size have higher dielectric strength c) Have lower dielectric strength as compared to pure liquids d) None of the above 9. Peak to peak ripple is defined as a) the difference between average de voltage and peak value b) the difference between maximum and minimum de voltage c) the difference between maximum ac and average dc voltages d) the difference between ac (rms) and average de voltages 10. In a Cockroft-Walton circuit, input voltage 100 kV load current 25 mA, supply frequency 100 Hz, each capacitor 10 nF. The optimum no. of stages for maximum output voltage is a) 1 b) 2 c) 10 d) 35

Lightning and thunder and is a case of large scare electrostatic discharge and can create visible sparks that can damage electronic devices. Discuss how diodes are used to protect the electronics devices from electrostatic discharge or even against lightning.

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.

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