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O&P General electr

O&P General

QuestionAnswer
What is Ohm’s Law? The mathematical relationship between Voltage, Amperage, and Resistance or simply E=I×R
What is the unit of measurement for Electrical power(P)? Watts
What is the electric power equation? P=I×E or Current x Volts
What does Kirchhoff’s laws explain? How Voltage (E), Current (I), Resistance (R), and Power (P) work individually in different circuits
In a Series Circuit, explain the relationship between, Volts, amps, and ohms. 1. Total voltage is equal to the sum of the individual voltage ET=E1+E2+E3 2. Current is constant throughout a series circuit IT=I1=I2=I3 3. Total resistance equals the sum of the individual resistances RT = R1+R2+R3
In a Parallel Circuits, explain the relationship between, Volts, amps, and ohms. 1. Voltage is constant throughout circuit ET=E1=E2=E3 2. Total current is equal to the sum of each current path IT=I1+I2+I3 3. Total resistance is sum of inversed inverses.... -> Rt=1/((1/R1)+(1/R2)+(1/R3))
What are Complex Circuits? A mix of Series Circuit and Parallel Circuit where the rules of both may be used depending of circuit setup
Why is AC is used extensively on larger aircraft? It saves weight
How is voltage and current manipulated? Step-up or Step-down transformers
What are Inductors and what do they create? Inductors are coils of wire that store electrical energy through a magnetic field. They create a magnetic field to counter the direction of current flow
What are Capacitors and what do they do? Capacitors are parallel metal plates separated by a small amount of insulating material. Capacitors store electrical energy by storing electrical charge on the plates.
What represents Inductors in AC math circuits? What represents Capacitors in AC math circuits? inductive reactance (XL) capacitive reactance (XC)
What is Impedance in AC circuits?And what is it represented by? Also what makes up Impedance? Impedance is a circuit’s total opposition to the flow of current. Z. inductive reactance (XL) and capacitive reactance (XC)
What is Ohm’s Law for AC Circuits? What does each symbol represent? E = I x Z E = volts I = current Z = Impedance
The typical aircraft lead-acid battery has how many cells? 6 to 12 cells
Lead-acid battery cells consist of what? positive plates and negative plates with separator plates and supporting ribs at the bottom
Lead-acid battery positive plates are made from what? lead dioxide
Lead-acid battery negative plates are made from what? spongy lead.
Why do they create space at the bottom of lead-acid batteries? for any sediment to settle without shorting the plates.
The electrolyte in lead-acid batteries (liquid in lead-acid batteries) consists of approximately what percentage? 30% sulfuric acid and 70% distilled water
The state of charge of a lead-acid battery can be determined by checking what with what? specific gravity with a hydrometer
What is the specific gravity of a fully charged lead-acid battery? 1.275 to 1.3
What are the two charging methods? constant voltage or constant current method
Describe Constant voltage charging method. A constant, regulated voltage charges the battery. It is the fastest way to charge any battery, due to the initial high current flow, which decreases as the battery charges. mostly used in planes
Describe Constant current charging method. Current remains constant and voltage varies to charge batteries. This method requires a longer time to charge a battery so its used in shop settings.
What type of battery is widely used in the aviation industry? Nickel-cadmium (NiCad) batteries. When properly maintained, they can last for years.
In NiCad batteries, the positive plates contain what? nickel hydrate
In NiCad batteries, The negative plates contain what? spongy cadmium
In NiCad batteries, The electrolyte (liquid in lead-acid batteries) consists of approximately what percentage? 30% potassium hydroxide and 70% distilled water
What is the main potential problem of NiCad batteries? Thermal Runaway
What causes Thermal Runaway? High discharge causes more heat which breaks down insulating layer that leads to less resistance. Less internal resistance leads to increased current flow which =s more heat
Can NiCad batteries be charged with Lead acid bateries? No
Created by: Wolfbane507
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