Electron Theory
Conductors
Formulas
Meters
Calculations
Series Circuits
Parallel Circuits
100
An Atom is made up of
What are protons, neutron, and electons
100
Conductor sizing is based on this sizing system
What is the AWG (American wire gauge)
100
Voltage is related to Current and Resistance in this way
what is E = I x R
100
This should never be applied to a live circuit
What is an Ohm Meter
100
A circuit has 10 ohms of resistance and 120v, it will have this much current
What is 12 A
100
True or False:
There is multiple paths for current in a SERIES circuit?
False
100
True or False:
There is multiple paths for current in a PARALLEL circuit?
True
200
An atom that has lost an electron, has a charge
what is a positive charge
200
These 4 factors impact conductor resistance
What are Length, Material, Temperature, Size (CMA or SMA)
200
Power is related to Current and Resistance in this way
what is P=I2 R
200
This meter needs to be connected in series with the Load
What is an Ammeter
200
A load draws 15Amps and has a resistance of 20 Ohms. What is the POWER output of the load?
4500W
200
This is the constant of a SERIES circuit
Current
200
The constant in a PARALLEL circuit is what?
Voltage
300
An atom has 3 components
what are neutrons, protons, and electrons
300
This multiplier is used to find a rough CMA for every 1 spot up or down on the AWG table
What is 1.26
300
Identify the formula you can use to find Resistance if you are given Power and Voltage values
R = E2/P
300
You must touch the leads and zero this time of analog meter before use
What is an Ohm meter
300
Original resistance of a copper conductor is 40 Ohms at 20 degrees C. What will be the resistance at 40 degrees C
Rc = 40 (.00393) (40-20)
Rc = 3.144
Rnew = Rc + Ro
What is 43.144 Ohms
300
True or False:
The sum of the voltage drops in a series circuit will equal the supply voltage?
True
300
True or False:
As you adds more loads to a parallel circuit, the total resistance decreases and the total current will increase?
True
400
An insulator has how many valence electrons
5 to 8
400
A #10 AWG has a CMA of 10000. Estimate the CMA for the theoretical #7 AWG
20000 CMA
400
Identify the Formula you can use to find Voltage if you are given Power and Resistance
400
When using a voltmeter to take measurements, this practice is very unsafe
What is touching the exposed conductor portion of the leads
400
A load draws 10A at 240V. If you connect this load to 480V, what will be the new Power Output?
9600 W
400
The sum of the individual resistances in a SERIES circuit will give us this value: ______
Total Resistance
400
The sum of the currents in each individual branch of a parallel circuit add up to equal what?
Total Current
500
A conductor has this many valence electrons
What is 1-3
500
A #14 AWG RW90 copper conductor is connected to 2 loads. The temperature termination rating of Load 1 is 60 degrees C and the temperature termination rating of Load 2 is 75 degrees C. The ampacity of the RW90 conductor is
What is 15A
500
The Resistance of a conductor is expressed this way
what is R = (KL)/CMA
500
A small mirror is installed in analog meter to prevent this type of error
What is Parallax error
500
A light draws 10Amps and is installed 300 ft away from the source. The conductors are #10 AWG copper (CMA of 10000) with a 120V source. The line drop will be
VD = (KLI2)/CMA
VD = [10.4(300)(10)(2)]/10000
VD = 6.24 V
What is 6.24V
500
The total current in this circuit is?
3 Amps
500
State Kirchoff's Current Law
The sum of the currents entering the node must equal the sum of the currents leaving the node
600
In Canada we teach Electron Flow Convention. With regards to current moving through a SOURCE, does the current move positive to negative or negative to positive?
positive to negative through a source
600
Find the total CMA AND SMA of the stranded conductor shown below
63 175 CMA
49617.645 SMA
600
Line Drop is expressed in this way
what is VD = (KLI2)/CMA
600
This type of meter is used to measure the insulation integrity of conductors and other electrical machines
Megger
600
The resistance of a 200 ft long #10 AWG (CMA 10000) aluminum conductor will be
R = (KL)/CMA
R = [17(200)]/10000
R = .34 Ohms
What is .34 Ohms
600
Find the resistance of the conductors in the following circuit
2 Ohms
600
Find the total current in this circuit:
35 Amps
700
X has a polarity of +20 and Y has a polarity of -20. With reference to Y, X has a polarity of
What is +40
700
A #12 AWG RW90 copper conductor is ran in a conduit with 5 other current carrying conductors. (ambient temperature of 20 degrees C). The ampacity of this RW90 conductor will be
What is 24A
(use the correction table 5C to find that 4-6 current carrying conductors requires the ampacity to be de-rated by 80%)
700
Coulomb's Law is express in this way
What is F = (K x Q1 x Q2)/d 2
700
A Current Transformer has a turns ratio of 4:1. If the line current is 200Amps, what is the output current reading on the ammeter connected across the secondary of the Current Transformer?
4 Amps
700
An electric motor drives a generator. The motor draws 200A at 240V. It has a rated HP output of 60HP. The Generator outputs 55HP. What is the overall efficiency of this motor/generator unit?
85.5%
700
What resistive value and wattage rating of a series resistor that is required to allow a 150 watt 120 volt lamp to operate from a 200 volts supply?
64 ohms
100 Watts
700
Find the total resistance for this circuit
1 Ohm