What are the 2 types of Current electricity?
- Alternating Current (AC)
2. Direct Current (DC)
What are the 2 types of Electricity?
- Static - not often useful
2. Current - AC/DC
How is Current electricity produced?
- Electrons move through a circuit and perform work
1. Magnetic Field
2. Heat Generation
What type of electricity does an Alternator use?
AC
What kind of electricity comes a battery?
DC
What type of electricity would an energy storage device for remote starting have?
DC
What are the 6 ways we can PRODUCE energy?
- Friction
- Heat
- Light
- Pressure
- Chemical Reaction
- Magnetism
What is Thermocoupling?
- A loop of different metals with 2 junctions
- Electric current will flow through wires when there is a temperature differential
Explain Light energy. Is there anything in out aircraft that uses this?
- Light is energy
- When light strikes photoemissive materials, electrons are forced to scatter and do work
Ex: PFD!
Explain Pressure energy. What is 1 example?
- When a material with Piezoelectricity is bent/deformed by a mechanical force
- Excess of electron accumulation on the surface
Ex: Record Player
Explain Chemical energy
An imbalance of electrons (E will move from high to low, being forced through a conductor which creates a chemical reaction)
What is 1 coulomb?
- An electrical quantity
- 6.28 x 10 to the 18th power
1 ____ is the movement of 1 coulomb per second
1 amp = movement of 1 coulomb per second
What is the measurement of flow/current?
Amps
1 ____ is the resistance through which 1 volt can force 1 amp (to flow)
1 ohm = resistance through which 1 volt can force 1 amp
What is the measurement of resistance?
Ohms
What is the measurement of pressure?
Volts
1 HP = _____ (mechanical)
33,000 ft/lbs per minute (mechanical)
1 HP = _____ (electrical)
746 watts
If you have a 110 volt/9 amp motor, how many Watts is it?
110 x 0.9 = 99 Watts
What is the equation for calculating Watts?
Watts = Volts x Amps
What kinds of electricity is found in wall socket outlets?
AC
What kind of electricity do our laptops utilize?
DC
What is a TRU? What does it do?
- Transformer Rectifying Unit
- Transforms AC to DC
Will you ever have AC batteries?
NO
What is the equation for Amps?
Amps = Volts/Resistance
- Current/flow is directly proportional to pressure, and inversely proportional to resistance
True of False: Current can only flow one direction.
TRUE
______ Current is constantly changing in direction (phase) and amplitutde
Alternating Current (AC)
___ Current is based on the flow in ONE direction (- or +)
Direct Current (DC)
Simply put, what is a battery?
An energy storage device!
- Device composed of 1+ cells in which CHEMICAL energy is converted into ELECTRICAL energy
What kind of batteries ARE rechargable?
Secondary Cell Batteries (vs Primary Cell)
What is RATED Capacity?
- Indicates a battery’s ability to perform when it is new
pg 182
What 3 things affect charge?
idk
What 2 things will affect the Condition of a battery?
Degraded by:
- Age
- G-Force stress
Explain Series Circuits (pg 210) DRAW IT
- ALL electrons must flow through ALL active components
Explain Parallel Circuits (pg 210) DRAW IT
- A portion of current flows through each filament
AIRCRAFT electrical system. What are the 6 main components?
(pg 213-220)
- The source of power (12v Negative Ground - Negative terminal of battery is connected to the air frame)
- Master Solenoid/Switch (Way to isolate the battery from rest of electrical system)
- Starter Circuit (Electrons flow from battery and through the Starter Motor Circuit and Control Circuit in a constant loop)
- The Busbar (Circuit breakers installed/mounted on a busbar)
- Individual Working Circuits (connected through busbar, protected by circuit breaker, controlled by a switch)
- The Alternator (E pump)
Alkaline, carbon zinc, and lithium ion are examples of what type of battery?
Primary (dry) cell batteries
Lead acid and nickel-cadmium (NiCad) are examples of what type of battery?
Secondary (wet) cell batteries
~ Rechargeable
What 3 things will affect ACTUAL Capacity of a battery?
- Battery Temperature
- Battery State of Charge
- Battery Condition
Battery condition is degraded by what 2 things?
- Age
2. G-Force
Explain what happens with a Thermal Runaway
- Rise in battery temperature leading to rise in current
- The battery begins to accept ALL of the charging current the source is capable of producing
- Battery gets so hot that it may explode or melt
What are 4 general facts about Generators?
- AC or DC Generators
- Stationary magnets, rotating conductor/coil
- Simpler, easier to control
- Most common in Turbine engine a/c
Describe an AC Generator. What are its main components? What 3 things does current output depend on?
- 1 conductor/coil formed into a loop with ends attached to SLIP RINGS
- Brush
- Sine Wave (output) varies
- Amount of current produced depends on:
1. # of lines of flux
2. # of conductors cutting the flux
3. Speed at which conductors move through the flux
Describe a DC Generator. What are its main components?
- Ends of conductor/coil are attached to a SPLIT RING
- Negative and Positive Brush
- AC is generated in the coil/armature and SPLIT RING commutator causes E flow through LOAD to all be in 1 direction
- Commutator creates the pulseating DC output
What are the 2 basic types of batteries? What makes them different?
- Primary - Cannot be recharged
2. Secondary - Rechargeable