MECHELEC PART 1-1-3.pdf

AR 353 BUILDING UTILITIES 2 (ELECTRICAL, ELECTRONICS, AND MECHANICAL SYSTEMS) AAParungao ELECTRICAL SYSTEMS...

AR 353 BUILDING UTILITIES 2 (ELECTRICAL, ELECTRONICS, AND MECHANICAL SYSTEMS) AAParungao ELECTRICAL SYSTEMS 1. GENERAL 1.1 Definition of Electricity Electricity is a form of energy generated by friction, introduction, or chemical change, having magnetic chemical and radiant effects. It is the motion of free electrons through a solid conductor. An electric current travels at the speed of light and, therefore the rate of conduction of an electric current is considered instantaneous. form of energy generated by friction, induction Notes: William gilbert "father of electricity" 1. William Gilbert an English Physicist is considered as “Father of Electricity” for his studies on “Electric Attraction” and “The Electric Force”. 2. Electricity is a property of the primary particles of matter, which like an atom, consists of a negative charge, an electron; the positive charge is a proton; and the neuron, which is not electrically charged. -dynamic electricity (electrodynamic) -static electricity (electrostatic) 3. There are two (2) general classes of electricity: dynamic electricity (electrodynamic) which flows through a substance in the form of an electric current, and static electricity (electrostatic). 1.2 Sources of Electricity combination of 2 or more electric cells for storing and supplying direct current by A. BATTERY electrochemical means. A combination of two or more electric cells capable of storing and supplying direct current by electrochemical means. delivers electricity as soon its parts assembled 1. Primary Batteries – delivers electricity as soon as its parts are assembled or assembled, provided it is connected to a circuit. https://www.theengineeringknowledge.com/wp-content/uploads/2021/08/Types-of-Battery.jpg 1|P a g e  AR 353 BUILDING UTILITIES 2 (ELECTRICAL, ELECTRONICS, AND MECHANICAL SYSTEMS) AAParungao electricity from some external source must be passed through it before it could be delivered 2. Secondary / Storage Batteries - electricity from some external source must be passed (changing the battery) through it before it can deliver an electric current “changing the battery”. The main uses are: to supply emergency circuits for hallways, stairways, and exits and to energize police and fire alarm systems and certain types of signal systems. main purposes: supply emergency circuits for hallways, stairways and exit to energize police and fire alarm systems https://www.theengineeringknowledge.com/wp-content/uploads/2021/08/Secondary-Battery-Types.jpg B. GENERATOR mechanical energy to electrical energy A machine converts mechanical energy into electrical energy. 1. Alternating Current Generators or Alternators – The bulk of electrical energy utilized today is a form of alternating current, including energy for power and lighting. bulk of electrical energy https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcQb77FCS32__WRMzcx0pq4xOUqkVNEaJ3mBeaeVs2j6Viz1tvaf furnish electric energy for elevator, intercommunicating tele systems 2. Direct Current Generators – These furnish electric energy for elevators, intercommunicating telephone systems, control of signal systems, and clock system. Six Otis motor-generator sets and starter panels Image provided by: Chris Williams - U.S.A. 2|P a g e  AR 353 BUILDING UTILITIES 2 (ELECTRICAL, ELECTRONICS, AND MECHANICAL SYSTEMS) AAParungao 1.3. Other Dynamo Electric Machines A. MOTORS electrical energy to mechanical energy A machine that converts electrical energy into mechanical energy. https://t1.gstatic.com/images?q=tbn:ANd9GcQrrl2hTagR2iYPUh8pqzCe9YBH8vrwUeHMNANvT- 58Mb-RMG4o https://t1.gstatic.com/images?q=tbn:ANd9GcSG2y7XwGuHk- _COjYPmBxS8nY3mMObdZ1ITLExWFI_zjEZ4GFg B. TRANSFORMERS 1 voltage to another from lower to higher (step-up transformer) from higher to lower (step-down transformer) For converting one voltage to another from lower to higher (step-up transformer) from higher to lower (step-down transformer). The two types of transformers are the a) Oil –insulated Transformers and the b) Dry type transformers. 1. Outdoor Transformers high as 1000 kva  H-frame transformer bank – capacity as high as 1,000 KVa https://img.directindustry.com/images_di/photo-mg/50469-16511801.webp  Cluster mounted on a 225 kva capacity single pole – 225 KVa capacity https://upload.wikimedia.org/wikipedia/commons/thumb/b/b2/Distribution_Voltage_regulators.JPG/1200px- Distribution_Voltage_regulators.JPG?20150308051238 3|P a g e