University of the Philippines College of Science PHYSICS 72 SET A Second Semester 2010-2011 First Long Examination National Institute of Physics 2nd Sem AY 2010-2011 Physics 72 INSTRUCTIONS: Choose the best answer and shade the corresponding circle on your answer sheet. To change your answer‚ cross-out and sign your original answer and then shade your new answer. No computational devices allowed (e.g. calculators‚ mobile phones). Following instructions is part of the exam. Useful
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Physical Properties of Materials By Will Paxton 3/5/07 Abstract The electrical properties of 5 different samples were studied. Characterization of these samples was through the dielectric properties‚ as this is a very important step. The capacitance was measured for each sample incrementally while heating them up to 135ºC. In a second part to the experiment‚ piezoelectric samples were studied‚ and their piezoelectric coefficient was calculated. Introduction The objective of the experiment
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Materials for Cables Classification of Cables Cables for 3-Phase Service Laying of Underground Cables Insulation Resistance of a Single-Core Cable Capacitance of a Single-Core Cable Dielectric Stress in a Single-Core Cable Most Economical Conductor Size in a Cable Grading of Cables Capacitance Grading Intersheath Grading Capacitance of 3-Core Cables Measurements of Ce and Cc Current-Carrying Capacity of Underground Cables Thermal Resistance Thermal Resistance of Dielectric of a
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and non-linear‚ including in instrumentation‚ filtering and power conversion. • AC Bridges‚ as the name suggests are alternating current bridges operates in alternating current supply. • It is used to measure:- • resistance • Inductance • Capacitance • Frequency ACKNOWLEDGEMENT:- • The main objective of this presentation is to obtain first-hand knowledge on how AC BRIDGES works and how it can be applied to the main work field and also to prove its main impact in the field of Engineering
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thesis first explained the definition of supercapacitor and the construction of the supercapacitor. Next the thesis discuss on the needs of supercapacitor with higher capacitance. The thesis then shows the difference between batteries and supercapacitors followed by the different amount of supercapacitors which provides higher capacitance. Next‚ the software simulations are done with 3.1 Cadence_SPB_16.3 and results are shown. Hardware is designed and soldered onto the circuit board. Lastly‚ the field
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on the multimeter becomes less than. 5 The reading of V‚ t and lnV was tabulated. 6 A graph of lnV against t was ploted. 7 The gradient of the graph was determined. 8 The answer from [7]‚ and the value of capacitance Cwas used to determine a value for. The gradient‚. Here C was the capacitance and not intercept value. Data : Time‚ t ± 0.1s Voltage‚ Vc ± 0.01V Average‚ Vc ± 0.01V In Vc 0 11.14 11.95 11.55 2.45 5 8.34 7.82 8.08 2.09 10 6.03 4.69 5.36 1.68 15 3.43 7.08 3.26 1.18 20 2.15 1.96 2.06
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APPLICATION NOTE 1002 ISO LINK Isolink Optocouplers vs. Pulse Transformers In isolation applications where one needs to pass signals in presence of transient or continuous high voltages‚ reject extreme noise‚ and break ground loops‚ optical (optocouplers) and magnetic (pulse transformers) coupling isolation are often used. However pulse transformers are much more difficult to design with relative to optocouplers. When dealing with pulse transformers‚ the load becomes more critical than
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significant amount of inductance and/or capacitance. AC circuits that include inductance are any circuits that include a coil as the load such as motors‚ transformers‚ and solenoids. AC circuits that include capacitance are any circuits that include a capacitor(s). In DC and AC circuits that do not contain a significant amount of inductance and /or capacitance‚ the opposition to current flow is resistance (R). In circuits that contain inductance (XL) or capacitance (XC)‚ the opposition to the flow of
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density when compared to common capacitors‚ typically on the order of thousands of times greater than a high capacity electrolytic capacitor. For instance‚ a typical electrolytic capacitor will have a capacitance in the range of tens of millifarads. The same size super capacitor would have a capacitance of several farads.electrochemical double layer capacitors (EDLCs)‚ or ultracapacitors‚ are electrochemical capacitors that have an unusualment of about two conventional electrolytic capacitors the
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FM Modulator and Demodulator Nor Ayu Hidayah Binti Mohd Safri (31743) Department of Electronic Engineering (Computer) Universiti Malaysia Sarawak‚ Malaysia Kuching‚ Sarawak‚ Malaysia Email : nor_ayu92@yahoo.com Abstract This paper presents about FM modulator and Abstractdemodulator.In electronic and telecommunication‚ modulation process of varying one or more properties of a high frequency periodic waveform ‚ called carrier signal with a modulating signal which typically contain information to
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