BLOCK VIII - ELECTRICAL Flashcards
What effects can electrical shock have on the human body?
-Stop the heart
-Stop the lungs
-Cause severe injury
-Cause death
State and describe the types of voltage
AC-flows in both directions simultaneously (prime for most P-8 systems)
DC-flows in one direction (emergency/backup systems and systems essential for flight)
Sources of AC power for the P-8A
-IDG
-APU gen
-External power
-Static inverter
Sources of DC power for the P-8A
-Batteries
-Transformer Rectifier Units
Unit of measure for electrical current
Amperes (amps)
Define resistance
Impedes the amount of volts/amps in a circuit
Ohm’s Law
Current through a conductor between two points is directly proportional to the voltage across two points.
Frequency
The number complete alternations per second of an AC circuit. (measured in hertz)
Electrical bus
A central point at which either AC or DC voltage is distributed throughout multiple systems
Circuit breakers
a pull-push type, overcurrent protection device that is resettable
Fuse
An overcurrent protection device that is for one-time use only
Relay
An electrical actuated switch used to control the distribution of electricity in a circuit
Output of the Integrated Drive Generator (IDG)
Three-phase, 115/200 V ac, 400 Hz power for use by the electrical power system
Batteries used on P-8A
-Main
-Aux
Purpose of the Transformer Rectifier Units (TRU’s)
TRU’s receive AC (115 VAC, 400 Hz) electrical power and convert it to a nominal 28 VDC for systems requiring DC power.
