BULITAS

33問 • 1年前

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science dealing with the physical phenomena arising from the existence and interaction of electric charges. It is a form of energy generated by friction, induction or chemical change, having magnetic, chemical and radiant effect

electricity

Greek philosopher of about this time, observed that amber, a stone-like substance attracted small bits of straw after being rubbed with cloth

thales

electricity that flows through a substance or over its surface in the form of an electric current

dynamic electricity

form of electricity that appears to remain on the surface of a body as a change

static electricity

sources of electrcity

mechanical

two types of mechanical electric

electrostatic

electric current

effects of electric current

magnetic

father of electrcity

william gilbert

where the electricity enters and is regulated

service

the conductors that carry the current to all parts of the building

distribution

where the current is utilized

circuit

a conductor having no covering or electrical insulation whatsoever

bare

a conductor encased within material of composition or thickness that is not recognized by code as electrical insulation

covered

a conductor encased within material of composition and thickness that recognized by the code.

insulated

a protective device with a fusible element that opens the circuit by melting when subjected to excessive current.

fuse

all circuit conductors between the service equipment, the source of a separately derived system, or other power supply source and the final branch-circuit overcurrent device. Flasho

feeder

unit of capacitance defined by the production of one volt across the capacitor terminals when a charge of one coulomb is stored

farad

a branch of electrical science dealing with the laws of electricity at rest

electrostatics

an insulating and protective lining for one or more conductors passing through a hole

bushing

a rubber or plastic washer inserted in a hole in a metal part to prevent grounding of a wire passing through the hole

grommet

good conductors

silver

conductor insulation

thermoplastic

insulating materials

rubber

enclosed channel designed expressly for holding wires, cables, or busbars with additional functions

raceway

device intended for on-off control of circuits and electrical isolation of equipment; a piece of apparatus or device for making, breaking, or changing the connection in an electrical current in the circuit

switches

that part of a switch, which is used for making or breaking a connection, and which is electrically insulated from other contact

pole

the direction from a given position in which the contact is made it also indicates the number of times a contact is made.

throw

one which will make a close circuit only when a circuit is thrown in one position

single throw switch

makes a close circuit in either one of the two positions

double throw switch

a switch may be constructed with or without provision for fusing

fusibility

all switches except snap switches or knife switches mounted on a switchboard must be enclosed in an appropriate cabinet as a protection from external damage

enclosure

these are free standing assemblies of switches, fuses, and/or circuit breakers, which normally provide switching and feeder protection to a number of circuits connected to a main source

switchboards

M#5 Section and Title v2

ユーザ名非公開 · 32問 · 13日前

M#5 Section and Title v2