ELECTRICAL THEORY
If current can not flow through an electrical circuit the circuit is considered this.
What is an open circuit?
This is the force that pushes electrons through the resistance in a circuit.
What is voltage?
This is the unit of measurement used when calculating the resistance to current.
What is an Ohm?
The definition of a Luminaire as it pertains to the National Electrical Code can be found in this article of the code book.
What is Article 100?
This type of electrical meter should never be connected to a circuit when the circuit power is turned on.
What is an ohmeter?
This is produced when electrons move to a lower orbit and produce a photon.
What is light?
The voltage drop across any branch of a parallel circuit is the same as this.
What is the applied voltage?
This is the formula used to find current when power and voltage are known.
What is I=P/E?
amps = watts/volts
This is the ampacity of 1/0 RHW Aluminum as listed in Table 310.16 of the NEC.
What is 120 amps?
In a parallel circuit, this resistance value is always less than the lowest value resistor.
What is the total resistance?
This theory states that current flow is produced when an electron from one atom knocks electrons from another atom out of orbit
What is the Bump Theory?
This would be the voltage drop across each resistor in a 24 volt, series circuit that contains 4 equal resistors.
What is 6 volts?
This is the value of the current when an electrical circuit has a voltage of 50v and a resistance of 5 ohms.
What is 10 amps?
I=E/R
This NEC Table is used to apply adjustment factors to ampacities listed in Table 310.16 if there are more than 3 conductors in a raceway.
What is 310.15(C)(1)?
This is the formula for calculating the area of a circle.
What is TTR2 (pi x R squared)?
An atom is made up of these three components.
What are protons, neutrons and electrons?
This would be the applied voltage in a series circuit containing 2 resistors that are 25 volts and 60 volts repectively.
What is 85 volts?
Ohm's Law states that in an electrical circuit, this is directly proportional to the voltage and inversely proportional to the resistance.
What is the current?
Per the NEC, the ampacity of 90 degree rated conductors should be adjusted by this amount if the ambient temperature is 105 degrees F where the conductors are installed.
What is 0.87?
1 horsepower is approximately equal to this many watts.
What is 746 watts?
These are 3 of the 6 basic methods for producing electricity.
What are magnetism, chemical action, pressure, heat, friction and light?
This is the total resistance in a two-branch parallel circuit which has resistors of 30 ohms and 15 ohms.
What is 10 ohms?
(30 x 15) / (30 +15)
450/45
10
This is the total resistance on a 6400Watt circuit if the total current is 8 amps.
What is 100 ohms?
R=P/I2
R=6400/64
This is the area in circular mils of a #6 THHN copper wire with a total of 7 strands.
What is 26240?
In the following voltage drop formula, the letter "K" represents this value. It can vary based on the type of material used to make conductors.
ED=2KCIL/CM
What is the resistivity (ohms) per CM ft at 20 degrees C.?