COSC 325 – Final questions with verified
solutions
Conductor - correct answer ✔✔material that has very little resistance and permits electrons to move
through it easily
Insulator - correct answer ✔✔any material that has a very high resistance and resists the flow of
electrons
Generated electricity - correct answer ✔✔the alternating current (AC) created by power plant generator
Three phase - correct answer ✔✔three distinct wave cycles, 3-wires, 415V
Single phase - correct answer ✔✔power supply has one distinct wave cycle, single wire, 230V
Service panel - correct answer ✔✔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 - correct answer ✔✔a complete path (when on) for current to take and includes electrical control
devices, circuit protection, conductors, and load(s)
System ground - correct answer ✔✔is a special circuit designed to protect the entire distribution system
of a residence
Equipment ground - correct answer ✔✔is a circuit designed to protect individual components connected
to an electrical system
2 methods for grounding an electrical system - correct answer ✔✔metal water pipe and alternative
electrode
,Electrode - correct answer ✔✔is a long metal rod used to make contact with the earth for grounding
purposes
Fuse - correct answer ✔✔an electric overcurrent protection device used to limit the rate of current flow
in a circuit
Circuit breaker - correct answer ✔✔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) - correct answer ✔✔a fast-acting receptacle that detects low
levels of leakage current to ground and opens the circuit in response to the leakage
LOTO - correct answer ✔✔Lockout/Tagout
National Electrical Code (NEC) - correct answer ✔✔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 - correct answer ✔✔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 - correct answer ✔✔is stored energy a body has due to its position, chemical state, or
condition
Kinetic energy - correct answer ✔✔energy of motion (released potential energy)
Voltage (AC only) - correct answer ✔✔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 - correct answer ✔✔voltage that flows in 1 direction only (portable equipment)
, AC voltage - correct answer ✔✔voltage that reverses its direction of flow at regular intervals
(res,com,indust lighting and power distribution systems)
Rectifier - correct answer ✔✔a device that converts AC to DC by allowing the voltage and current to
move in only one direction
Single - correct answer ✔✔(AC) contains only one alternating voltage waveform
Three - correct answer ✔✔(AC) a combination of three alternating voltage waveforms, each displace 120
electrical degrees apart
Current - correct answer ✔✔the amount of electrons flowing through an electrical circuit (amperes)
Ampere/amp - correct answer ✔✔the number of electrons passing a given point in 1 second
Conventional current flow - correct answer ✔✔current flow from + to -
Electron current flow - correct answer ✔✔flow from - to +
Power (P) - correct answer ✔✔the rate of doing work or using energy
True power (PT) - correct answer ✔✔the actual power used in electrical circuit (watts, W)
Apparent power (PA) - correct answer ✔✔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 - correct answer ✔✔a circuit that contains only resistive components, such as heating
elements and incandescent lamps
solutions
Conductor - correct answer ✔✔material that has very little resistance and permits electrons to move
through it easily
Insulator - correct answer ✔✔any material that has a very high resistance and resists the flow of
electrons
Generated electricity - correct answer ✔✔the alternating current (AC) created by power plant generator
Three phase - correct answer ✔✔three distinct wave cycles, 3-wires, 415V
Single phase - correct answer ✔✔power supply has one distinct wave cycle, single wire, 230V
Service panel - correct answer ✔✔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 - correct answer ✔✔a complete path (when on) for current to take and includes electrical control
devices, circuit protection, conductors, and load(s)
System ground - correct answer ✔✔is a special circuit designed to protect the entire distribution system
of a residence
Equipment ground - correct answer ✔✔is a circuit designed to protect individual components connected
to an electrical system
2 methods for grounding an electrical system - correct answer ✔✔metal water pipe and alternative
electrode
,Electrode - correct answer ✔✔is a long metal rod used to make contact with the earth for grounding
purposes
Fuse - correct answer ✔✔an electric overcurrent protection device used to limit the rate of current flow
in a circuit
Circuit breaker - correct answer ✔✔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) - correct answer ✔✔a fast-acting receptacle that detects low
levels of leakage current to ground and opens the circuit in response to the leakage
LOTO - correct answer ✔✔Lockout/Tagout
National Electrical Code (NEC) - correct answer ✔✔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 - correct answer ✔✔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 - correct answer ✔✔is stored energy a body has due to its position, chemical state, or
condition
Kinetic energy - correct answer ✔✔energy of motion (released potential energy)
Voltage (AC only) - correct answer ✔✔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 - correct answer ✔✔voltage that flows in 1 direction only (portable equipment)
, AC voltage - correct answer ✔✔voltage that reverses its direction of flow at regular intervals
(res,com,indust lighting and power distribution systems)
Rectifier - correct answer ✔✔a device that converts AC to DC by allowing the voltage and current to
move in only one direction
Single - correct answer ✔✔(AC) contains only one alternating voltage waveform
Three - correct answer ✔✔(AC) a combination of three alternating voltage waveforms, each displace 120
electrical degrees apart
Current - correct answer ✔✔the amount of electrons flowing through an electrical circuit (amperes)
Ampere/amp - correct answer ✔✔the number of electrons passing a given point in 1 second
Conventional current flow - correct answer ✔✔current flow from + to -
Electron current flow - correct answer ✔✔flow from - to +
Power (P) - correct answer ✔✔the rate of doing work or using energy
True power (PT) - correct answer ✔✔the actual power used in electrical circuit (watts, W)
Apparent power (PA) - correct answer ✔✔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 - correct answer ✔✔a circuit that contains only resistive components, such as heating
elements and incandescent lamps
