Electrical System Flashcards
The number of electrons flowing around a circuit is measured in what
AMPS
The force in which electrons are moved around a circuit is measured in what
VOLTS
Resistence is measured in what
OHMS
What are the 2 current types
- DC
- AC
What typically generates a DC current
BATTERIES
Why 2 things typically generate an AC current
- Generators
- Alternators
What is the equation for resistors in series
R total = R1 + R2 + R3
What is the equation for resistors in parallel
1 / R total = 1 / R1 + 1 / R2 + 1 / R3
What is a capacitor
Components that can store electrical charge
Electrons flow in which direction
NEGATIVE to POSITIVE
Conventional electron flow is considered to flow in which direction
POSITIVE to NEGATIVE
What is the equation for capacitors in series
1 / C total = 1 / C1 + 1 / C2 + 1 / C3
What is the equation for capacitors in parallel
C total = C1 + C2 + C3
A wire moved through a magnetic field producing a current is considered what
GENERATOR or ALTERNATOR
A current passed through a wire producing a magnetic field which produces motion is considered what
MOTOR
What is the definition of static electricity
Imbalance of electrical charge
How is static electricity encouraged to dissipate on aircraft
STATIC WICKS
What are 2 possible results of lightening strike on a metal airframe
- Puncture holes
- Wingtips blown off
What is a possible result of a lightening strike on a glass reinforced plastic aircraft
EXPLODE
What are 4 systems that can be damaged by a lightening strike
- Compass
- Communications Radios
- NAV equipment
- Computer
What are 2 temporary effects on a pilot following a lightening strike
- Blindness
- Deafness
The 2 typical voltage of aviation batteries
- 12V
- 24V
What is battery capacity measured in
AMPERE HOURS (Ah)
How many amps can a 100Ah battery deliver;
1. 1 hour
2. 2 hours
3. 30 minutes
- 100 Amps
- 50 Amps
- 200 Amps
2 x 12V 120Ah batteries are connected in series. What is the total;
1. Voltage
2. Capacity (Ah)
- 24 V
- 120 Ah
REMEMBER: **
VOLTS in SERIES - Ess sound at end of VoltS** sounds like SERIES
AMPS in PARALLEL - the “Ah” sound of amp sounds like the “ah” sound in pArallel
2 x 6V 220Ah batteries are connected in parallel. What is the total;
1. Voltage
2. Capacity (Ah)
- 6v
- 440 Ah
REMEMBER: **
VOLTS in SERIES - Ess sound at end of VoltS** sounds like SERIES
AMPS in PARALLEL - the “Ah” sound of amp sounds like the “ah” sound in pArallel
What device is used to convert AC to DC
RECTIFIER
What are 2 devices typically used in aviation to provide charging to aircraft battery
- Generator
- Alternator
How is the magnetic field in an alternator produced
FIELD WINDING
Coil of wires
Coil needs a source of electricity to produce a magnetic field
What is a key difference between an alternator compared to a generator
DOES NOT CONTAIN MAGNETS
A GENERATOR or ALTERNATOR produce electrical power at lower RPM
ALTERNATOR
What is the purpose of a Solenoid or Relay
SLAVE DEVICE
Prevents high current being connected to a switch operated by the pilot
Pilot operates a switch that uses a small current to operate a switchin within the Solenoid/Relay
This allows a high current to then be passed to the on load device
What does the master switch operate
BATTERY SOLENOID
Connects battery power via solenoid contacts to power bus
What is a power bus bar used for
ELECTRICAL POWER DISTRIBUTION
What is the name of the cog and spring arrangement in a starter motor
BENDIX
Bendix is withdrawm from the flywheel
When the engine starts and pilot releases the starter mechanism, what happens within the starter motor
BENDIX DISENGAGES
