tailieunhanh - FUNDAMENTALS OF ELECTRIC DRIVERS

Crystal radio receiver - also known as crystal receiver - radio is a simple yet very common in the early days of radio industry. No batteries or other power source to an activity that uses the power received from radio waves through a very long wire antenna and high. In Vietnam, formerly known as Galen | Source ELECTRICAL EQUIPMENT HANDBOOK CHAPTER 1 FUNDAMENTALS OF ELECTRIC SYSTEMS CAPACITORS Figure illustrates a capacitor. It consists of two insulated conductors a and b. They carry equal and opposite charges q and q respectively. All lines of force that originate on a terminate on b. The capacitor is characterized by the following parameters q the magnitude of the charge on each conductor V the potential difference between the conductors The parameters q and V are proportional to each other in a capacitor or q CV where C is the constant of proportionality. It is called the capacitance of the capacitor. The capacitance depends on the following parameters Shape of the conductors Relative position of the conductors Medium that separates the conductors The unit of capacitance is the coulomb volt C V or farad F . Thus 1 F 1 C V It is important to note that C dt but since i dt Thus i C This means that the current in a capacitor is proportional to the rate of change of the voltage with time. dv dt dV dt Downloaded from Digital Engineering Library @ McGraw-Hill Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. FUNDAMENTALS OF ELECTRIC SYSTEMS CHAPTER ONE FIGURE Two insulated conductors totally isolated from their surroundings and carrying equal and opposite charges form a capacitor. In industry the following submultiples of farad are used Microfarad 1 pF 1O6 F Picofarad 1 pF 10 12 F Capacitors are very useful electric devices. They are used in the following applications To store energy in an electric field. The energy is stored between the conductors which are normally called plates. The electric energy stored in the capacitor is given by UE 1 2 C To reduce voltage fluctuations in electronic power supplies To transmit pulsed signals To generate or detect electromagnetic oscillations at radio frequencies To provide electronic time delays Figure .

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