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COSC 325 – Final Exam/342 Q’s and A’s /A+ Graded
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COSC 325 – Final Exam/342 Q’s and A’s /A+ Graded
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COSC 325 – Final Exam/342 Q’s andA’s /A+ Graded
Conductor - - material that has very little resistance and permits electrons to
move through it easily
- Insulator - - any material that has a very high resistance and resists the
flow of electrons
- Generated electricity - - the alternating current (AC) created by power
plant generator
- Three phase - - three distinct wave cycles, 3-wires, 415V
- Single phase - - power supply has one distinct wave cycle, single wire,
230V
- Service panel - - is an electrical device containing fuses or circuit breakers
for protecting the individual circuits of a residence and serves as a means of
disconnecting the entire residence from the distribution system
- Circuit - - a complete path (when on) for current to take and includes
electrical control devices, circuit protection, conductors, and load(s)
- System ground - - is a special circuit designed to protect the entire
distribution system of a residence
- Equipment ground - - is a circuit designed to protect individual
components connected to an electrical system
- 2 methods for grounding an electrical system - - metal water pipe and
alternative electrode
- Electrode - - is a long metal rod used to make contact with the earth for
grounding purposes
- Fuse - - an electric overcurrent protection device used to limit the rate of
current flow in a circuit
- Circuit breaker - - is an overcurrent protection device with a mechanical
mechanism that may manually or automatically open a circuit when an
overload condition or short circuit occur
, - Ground Fault Circuit Interrupter (GFCI) - - a fast-acting receptacle that
detects low levels of leakage current to ground and opens the circuit in
response to the leakage
- LOTO - - Lockout/Tagout
- National Electrical Code (NEC) - - is a book of electrical standards that
indicate how electrical systems must be installed and how work must be
performed. Standards for residential, commercial, and industrial electrical
work
- National Fire Protection Association: NFPA 70E - - standard for electrical
safety in a workplace, addresses electrical safety requirements for employee
workplaces that are necessary for safeguarding employees in pursuit of
gainful employment
- Potential energy - - is stored energy a body has due to its position,
chemical state, or condition
- Kinetic energy - - energy of motion (released potential energy)
- Voltage (AC only) - - is the amount of electrical pressure in a circuit.
Produced any time there is an excess of electrons at one terminal and
deficiency in an other, the greater the difference = higher voltage
- DC voltage - - voltage that flows in 1 direction only (portable equipment)
- AC voltage - - voltage that reverses its direction of flow at regular intervals
(res,com,indust lighting and power distribution systems)
- Rectifier - - a device that converts AC to DC by allowing the voltage and
current to move in only one direction
- Single - - (AC) contains only one alternating voltage waveform
- Three - - (AC) a combination of three alternating voltage waveforms, each
displace 120 electrical degrees apart
- Current - - the amount of electrons flowing through an electrical circuit
(amperes)
- Ampere/amp - - the number of electrons passing a given point in 1 second
- Conventional current flow - - current flow from + to -
- Electron current flow - - flow from - to +
, - Power (P) - - the rate of doing work or using energy
- True power (PT) - - the actual power used in electrical circuit (watts, W)
- Apparent power (PA) - - the product of voltage and current in a circuit
calculated without considering the phase shift that may be present between
the voltage and current in the circuit (Volt amps, VA)
- Resistive circuit - - a circuit that contains only resistive components, such
as heating elements and incandescent lamps
- In - - phase - the state when voltage and current reach their mac
amplitude and zero level simultaneously
- Inductance - - the property of a circuit that causes it to oppose a change in
current due to energy stored in a magnetic field
- Capacitance - - is the ability of a component or circuit to store energy in
the form of an electrical charge
- Power factor (PF) - - the ratio of true power used in an AC circuit to
apparent power delivered to the circuit (PF=PT/PA x 100)
- Conductor materials - - material that has very little resistance and permits
electrons to move through it easily
- Insulator materials - - is a material that has a very high resistance an
resists the flow of electrons (rubber, plastic, air, glass, and paper)
- Converting celsius to fahrenheit - - F=(1.8xC)+32
- Electrical energy calculations (kWh) - - E=PxT
- Power formula - - is the relationship between Power, Voltage, and Current
in an electrical circuit P=ExI
- Electrical circuit - - an assembly of conductors (wires), electrical devices
(switches and receptacles), and components (lights and motors) through
which current flows
- Manually controlled circuit - - is any circuit that requires a person ti initiate
an action for the circuit to operate
- Component plan - - a group of schedules that state the required locations
for receptacles, lights, and switches according to the NEC and local codes
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