study words Flashcards
Current that reverses polarity or direction with regular frequency. It can be single phase, two phase, three phase, or polyphase.
Alternating Current (AC)
A tubing, piping, or electrical wire installation that permits flow from the energy source back to energy source.
Circuit
A device that senses current flow and opens when its rated current flow is exceeded.
Circuit Breaker
Local, state, and national rules and regulations.
Codes
Material or substance that readily passes electricity.
Conductor
The flow of electrons through a conductor.
Current
Electric current that flows only in one direction.
Direct Current (DC)
The presence and flow of an electric charge.
Electricity
Electrical safety device consisting of a strip of fusible metal in a circuit that melts when the circuit is overloaded.
Fuse
Breaker specifically designed to open the circuit in the event of a ground fault.
Ground Fault Circuit Interrupter (GFCI)
A meter that reads multiple electrical properties, typically including volts and ohms.
Multimeter
The opposition to current flow by a physical conductor.
Resistance
A low resistance connection (usually accidental and undesirable) between two parts of an electrical circuit.
Short Circuit
The potential difference between two points.
Voltage
Nonmetallic-sheathed cable is widely used for branch circuits and feeders in residential and commercial systems. It is flame-retardant and moisture resistant but suitable for dry locations only.
Type NM
Underground feeder cable is sunlight and moisture resistant, suitable for outside use, and can be buried under the ground.
Type UF
Another common type of cable is thermoplastic high heat-resistant nylon-coated and is suitable for dry and damp locations.
Type THHN
Using a wire that is too small can lead to
overheating and potentially fire.
12-gauge wire is often recommended for
residential applications.
The smaller the number (gauge), the larger the
diameter of the wire.
Wires larger than 1 gauge are designated as
0, 00, 000, and 0000.
how is electric current measured
amps
how is electric potential measured
volts
how is electric work measured
watts
how is resistance measured
Ohms
what is the masure of electrical charge
coulomb
The ability to make current flow is called
electromotive force or potential
