Final Prep Flashcards
What is electricity?
The flow of electrons.
Define Flux
Lines of magnetic force.
What type of current is produced by an armature cutting lines of magnetic flux?
AC
Resistance Rule in Parallel Circuits
What is the negative electrode in a battery called?
Cathode
What are the two types of Batteries?
Primary & Secondary
What is Power Law?
P = IE
Power = Current x Voltage
Ampere Rule in Parallel Circuits
The total current is the sum of all the currents through all branches of the circuit.
According to the Bohr Model how many electrons are in the shell #1(K)?
2
Name the three main parts of an Atom and their respective charge?
Proton (+), Electron (-), & Neutron (+-)
According to the Bohr Model how many electrons are in the shell #2(L)?
8
What is the coil in which voltage is induced by motion through a magnetic field called?
Armature
What device is connected to an armature in order to convert AC to DC?
Commutator
Electron Theory of Current Flow
Current flows from - to +
Voltage Rule in Parallel Circuits
The voltage across any part of the circuit is the same as the total voltage.
If a “AA” battery and a “D” battery were each connected to a load with identical resistance. Which battery would last longer?
The “D” battery has a greater surface area which increases it’s capacity, thus providing a higher ampere-hour rating than a “AA” battery.
According to the Bohr Model how many electrons are in the shell #3(M)?
18
A neutral wire is typically which color?
White/Grey
Using the Atomic number 13, and the electron orbit formula 2N2, is the element a conductor, semiconductor, or an insulator?
Conductor
Define Watt
Watt (W) is a measure of the amount of power used in a circuit.
Conventional Theory of Current Flow
Current flows from + to -
What is the ladder rule?
4:1 / For every 4 feet of ladder height you need to be a distance of 1 foot from the wall.
Define Reluctance
The resistance of magnetization.
Ampere Rule in Series Circuits
The current is the same at any point in the circuit.
In a 3-way switch what is the wire running from the second switch to the load called?
Switch Leg
Open Circuit
When an electrical circuit is incomplete.
What is the positive electrode in a battery called?
Anode
Define Ampere
Ampere (A) is a measure of electricity flowing through a circuit. 1A is equal to 1 Coulomb per second.
What is Static Electricity?
A buildup of electrons sitting still without moving.
Define Coulomb
6.25 x 1018 Electrons
Voltage Rule in Series Circuits
The sum of all voltage drops across resistors must equal the voltage applied to the circuit.
How many valence electrons does a semiconductor possess?
4-6
How much current does it take to be fatal?
100-200 Milliamperes (.001-.002 A)
What occurs when current flows through a conductor?
A magnetic field is generated around the conductor.
Define Resistance
An Ohm (Ω) is a measure of the opposition to electricity flowing through a circuit.
Closed Circuit
When an electrical circuit is complete and electricity is flowing.
How many valence electrons does a conductor possess?
1-3
Which of the two types of Batteries is rechargeable?
Secondary
Define Saturation
All the magnetic domains in a material are aligned so that it cannot become magnetized further.
Define Flux Density
The concentration of lines of magnetic force.
A ground wire is typically which color?
Green
What is Ohm’s Law?
E = IR
Voltage = Current x Resistance
The Atomic number of an element is 13, how many protons and electrons does this element have?
13 Protons & 13 Electrons
What is the most important rule to follow when working with electrical circuits?
To think… / Always make sure the circuit is de-energized.
Resistance Rule in Series Circuits
The total resistance to current flow is equal to the sum of all resistances.
How much power is consumed in a circuit containing 240 V, 20 A, and 12 Ω?
4800 W
What is a Voltaic Cell?
Two dissimilar metals submerged in an electrolyte solution.
Define Permeability
The ability to become magnetized.
Define Voltage
Voltage (V) is a measure of electrical pressure. / The potential difference between two points in a conducting wire.
Short Circuit
When a path to ground other than the intended path is established.
How many valence electrons does and insulator possess?
7-8
A common/hot wire is typically which color?
Black/Red
Define Residual Magnetism
The ability of a material to retain magnetization.
A 240 V circuit has a current flow of 20 A. How much resistance is connected in the circuit?
240 V / 20 A = 12 Ω
What is the “Law of Charges”?
Opposite charges attract, and like charges repel.
According to the Bohr Model how many electrons are in the shell #4(N)?
32
In a 3-way switch what are the wires running from the first switch to the second switch called?
Travellers
What is the maximum number of electrons that can occupy the outermost energy level or valence shell?
8
