30 Questions
What is the unit of electric resistance?
Ohm
Which unit represents the rate of doing electrical work?
Watt-hour
According to Ohm's Law, what happens to the current in a circuit if the resistance increases?
Current decreases
What is the unit of electric power?
Watt
Which component in an electric field moves a charge between two points?
Volt
What does electric load control aim to achieve?
Reduce demand charge
What is the main purpose of an Automatic Transfer Switch (ATS)?
To automatically supply emergency service on failure of normal power
How does a Fuse function in an electrical circuit?
It allows all current passing through the circuit to pass through it before melting
Which protective device functions as a switch as well as an overcurrent protector?
Circuit Breaker
What material is commonly used to make Wall Plates or Faceplates?
Plastic (Bakelite)
What is the function of Ground Fault Circuit Interrupters (GFCI) in an electrical system?
To provide ground fault protection and function as a circuit breaker
Where are the protective devices housed in an electrical system?
In panelboards
What is the function of panel boards and sub-panel boards in an electrical system?
To control and protect sub feeders and branch circuits
What does a bus do in an electrical system?
Collect, carry, and distribute large electric currents
What is the purpose of a grounding electrode in an electrical system?
Establish a ground connection
What happens when a fuse melts in an electrical circuit?
It automatically interrupts the circuit to prevent excess current
How does a circuit breaker differ from a fuse in an electrical system?
A circuit breaker can be reclosed and reused, while a fuse needs replacement
Where are the switches, fuses, and circuit breakers mounted for controlling branch circuits in an electrical system?
Panel boards
Where are lighting and outlet loads typically connected in a Three Phase AC electrical system?
Between any phase leg and a neutral line
What is the purpose of a transformer vault in a large building?
To house a transformer and auxiliary equipment
What is the function of a standby generator in a building's electrical system?
To act as a backup power source during outages
What is the purpose of a service entrance conductor in an electrical system?
To extend from a service drop to the building's equipment
What is the definition of a line drop in a power line system?
The decrease in voltage between two points caused by resistance or leakage
What is the role of a substation in an electrical system?
To step up or down voltage levels
What is another name for Non-Metallic Sheathed Cable?
ROMEX
Which type of cable is specifically designed for installation in cable trays, raceways, or where supported by wire?
Power and Control Tray Cable (Type TC)
What distinguishes Shielded Non-Metallic Sheathed Cable (Type SNM) from Non-Metallic Sheathed Cable (Type NM)?
Covering within an overlapping spiral metal tape
Which type of cable is recommended for direct burial in the ground as feeder or branch circuit?
Service Entrance Cable (Type SE or USE)
What is the main purpose of Flat Conductor Cable (Type FCC)?
Placement in square structural channels
Which cable type is provided with an overall covering and is primarily used for service wire?
Service Entrance Cable (Type SE or USE)
Learn about panel boards, sub-panel boards, and utilization equipment in electrical systems. Understand their functions in controlling and protecting sub feeders, branch circuits, lighting, power, and motor loads. Explore the main disconnects and components mounted on panel boards.
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