ARCH 502-3 BUILDING UTILITIES - 01 Electrical Systems Exam

ARCH 502-3 BUILDING UTILITIES - 01 Electrical Systems Exam Electricity - answerA form of energy generated by friction, induction or chemical change, having magnetic, chemical and radiant effect. The motion of free electrons through a solid conductor. Storage Battery - answerUsed to supply emergency lighting circuits for hallways, stairways, exits and to energize police and fire alarm systems and certain types of signal systems. Alternating Current Generator - answerSource of bulk electrical energy utilized today, including energy for power and lighting. Direct Current Generator - answerFurnish electrical energy for elevators, escalators, intercommunicating telephone systems, control of signal systems, and clock systems. Motor - answerUsed for converting electrical energy to mechanical energy. Transformer - answerUsed for converting one voltage to another, from lower to higher or from higher to lower. Rotary Converter - answerFor changing alternating current to direct current and vice versa. Alternating Current - answerA current which is periodically varying in time rate and in direction. It rises from zero to maximum, falls to zero, reverses its direction and again returns to zero. Direct Current - answerA current which flows at a constant time rate and in the same direction. Coulomb - answerUnit of electricity comprising approximately 6.25 x 10 18 electrons. Ampere - answerRepresents a rate of flow of one coulomb or 6.25 x 10 18 electrons/second through a given cross section. Volt - answerElectromotive force or potential difference between two points in an electric field which will move a charge of one coulomb between these points. Ohm - answerThe resistance which will allow one ampere of current to flow when one volt is impressed upon it. Watt - answerUnit of electric power or the rate of doing electrical work. Watt-Hours - answerThe unit of energy or the capacity for doing work. Ohm's Law - answerI (amp) = V (Volts) / R (Ohms) The current, I, that will flow in a d-c circuit is directly proportional to the voltage ,V, and inversely proportional to the resistance , R, of the circuit. Electric Load Control - answerThe effective utilization of available energy by reducing peak loads and lowering demand charge. Control Devices and Systems - answerCollective term for the following: 1. Load shedding control 2. Peak demand control 3. Peak regulation control 4. Power use control Load Scheduling and Duty Cycle Control - answerThe installation's electric loads are analyzed and scheduled to restrict demand by shifting large loads to off-peak hours and controlled to avoid coincident operation. Demand Metering Alarm - answerIn conjunction with a duty cycle controller, demand is continuously metered and an alarm is set on when a predetermined demand level is exceeded. Automatic Instantaneous Demand Control (Rate Control) - answerAn automated version of the demand metering alarm system, where it automatically disconnects or reconnects loads as required. Ideal Curve Control - answerThis controller operates by comparing the actual rate of energy usage to the ideal rate, and controls KW demand by controlling the total energy used within a metering interval. Forecasting Systems - answerComputerized systems which continuously forecast the amount of energy remaining in the demand interval, then examine the status and priority of each of the connected loads an