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#### Devildogwillbur

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Discussion Starter · ·
I am currently a student going into the industrial electrical field. I am working on a formula sheet that will help me, and a few other students. Could I have someone go over the following and let me know if there is anything else I am missing or anything that might be wrong? Here is a link to my word doc in skydrive.
http://sdrv.ms/QUZ7SY

#### HARRY304E

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##### RIP 1959-2015
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39,618 Posts
I am currently a student going into the industrial electrical field. I am working on a formula sheet that will help me, and a few other students. Could I have someone go over the following and let me know if there is anything else I am missing or anything that might be wrong? Here is a link to my word doc in skydrive.
http://sdrv.ms/QUZ7SY
Welcome to the forum..:thumbup:

#### Devildogwillbur

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##### Registered
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Discussion Starter · ·
Welcome to the forum..:thumbup:

Ok, sorry. try this one

https://skydrive.live.com/redir?page=view&resid=C05B3A64C64F3A9C!145&authkey=!AHFdbgdg-VrlfSg

#### HARRY304E

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##### RIP 1959-2015
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39,618 Posts
See if you can take a screen shot and post that.

#### HARRY304E

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##### RIP 1959-2015
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39,618 Posts
Okay I hope this is readable.

I'm on my I phone so maybe someone on a computer can make the picture bigger..:laughing:

#### Attachments

• 113.8 KB Views: 134

#### Devildogwillbur

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Discussion Starter · ·
I was trying to make it editable, here

#### 480sparky

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##### I own stock in FotoMat!
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39,117 Posts
Electrical Formulas Based on 60 Hz
Capacitive Reactance (XC) in Ohms = 1/(2p f C)
Effective (RMS) AC Amps = Peak Amps x 0.707
Effective (RMS) AC Volts = Peak Volts x 0.707
Efficiency (percent) = Output/Input x 100
Efficiency = Output/Input
Horsepower = Output Watts/746
Inductive Reactance (XL) in Ohms = 2p f L
Peak AC Volts = Effective (RMS) AC Volts x Peak Amps = Effective (RMS) Amps x
Power Factor (PF) = Watts/VA
VA (apparent power) = Volts x Ampere or Watts/Power Factor
VA 1-Phase = Volts x Amps
VA 3-Phase = Volts x Amps x
Watts (real power) Single-Phase = Volts x Amps x Power Factor
Watts (real power) Three-Phase = Volts x Amps x Power Factor x
Parallel Circuits
Total resistance is always less than the smallest resistor
RT = 1/(1/R1 + 1/R2 + 1/R3 +...)
Total current is equal to the sum of the currents of all parallel resistors
Total power is equal to the sum of power of all parallel resistors
Voltage is the same across each of the parallel resistors

Series Circuits
Total resistance is equal to the sum of all the resistors
Current in the circuit remains the same through all the resistors
Voltage source is equal to the sum of voltage drops of all resistors
Power of the circuit is equal to the sum of the power of all resistors

Transformer Amps
Secondary Amps 1-Phase = VA/Volts
Secondary Amps 3-Phase = VA/Volts x
Secondary Available Fault 1-Phase = VA/(Volts x %impedance)
Secondary Available Fault 3-Phase = VA/(Volts x x %Impedance)
Delta 4-Wire: Line Amps = Phase (one winding) Amps x
Delta 4-Wire: Line Volts = Phase (one Winding) Volts
Delta 4-Wire: High-Leg Voltage (L-to-G) = Phase (one winding) Volts x 0.5 x
Wye: Line Volts = Phase (one winding) Volts x
Wye: Line Amps = Phase (one winding) Amps

WYE
EP (primary) = EL / 1.732
IP (primary) = IP (secondary) / Ratio
EL (primary) =
IL (primary) = IP (primary)
Ratio = EP (primary) / EP (secondary)
WYE
EP (secondary) =
IP (secondary) =
EL (secondary) =
IL (secondary) =
WYE

DELTA
EP (primary) = EL (primary)
IP (primary) = IP (secondary) / Ratio
EL (primary) = EP (primary)
IL (primary) = IP (primary * 1.732
Ratio = EP (primary) / EP (secondary)
DELTA
EP (secondary) = EL (secondary)
IP (secondary) = IL (secondary) / 1.732
EL (secondary) = EP (secondary)
IL (secondary) = IP (secondary) * 1.732 = IL (load)
DELTA

Volts = E = V
Current = I = Amps
Resistance = R =
Capacitors = C = farared =
Inductance = XL = Henrys = H
Frequency = f
Phase = P
Line = L

#### HARRY304E

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##### RIP 1959-2015
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39,618 Posts
From sparky's post it looks good.

I don't think there is anything missing.

#### Devildogwillbur

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##### Registered
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Discussion Starter · ·
I am reading my book and i dont see where it is telling me how to get the Ep EL IP and IL for the secondary wye. The parts that im really most interesting in making sure are correct are the following:
WYE
EP (primary) = EL / 1.732
IP (primary) = IP (secondary) / Ratio
EL (primary) =
IL (primary) = IP (primary)
Ratio = EP (primary) / EP (secondary)
WYE
EP (secondary) =
IP (secondary) =
EL (secondary) =
IL (secondary) =
WYE

DELTA
EP (primary) = EL (primary)
IP (primary) = IP (secondary) / Ratio
EL (primary) = EP (primary)
IL (primary) = IP (primary * 1.732
Ratio = EP (primary) / EP (secondary)
DELTA
EP (secondary) = EL (secondary)
IP (secondary) = IL (secondary) / 1.732
EL (secondary) = EP (secondary)
IL (secondary) = IP (secondary) * 1.732 = IL (load)
DELTA

#### HARRY304E

·
##### RIP 1959-2015
Joined
·
39,618 Posts
I am reading my book and i dont see where it is telling me how to get the Ep EL IP and IL for the secondary wye. The parts that im really most interesting in making sure are correct are the following:
WYE
EP (primary) = EL / 1.732
IP (primary) = IP (secondary) / Ratio
EL (primary) =
IL (primary) = IP (primary)
Ratio = EP (primary) / EP (secondary)
WYE
EP (secondary) =
IP (secondary) =
EL (secondary) =
IL (secondary) =
WYE

DELTA
EP (primary) = EL (primary)
IP (primary) = IP (secondary) / Ratio
EL (primary) = EP (primary)
IL (primary) = IP (primary * 1.732
Ratio = EP (primary) / EP (secondary)
DELTA
EP (secondary) = EL (secondary)
IP (secondary) = IL (secondary) / 1.732
EL (secondary) = EP (secondary)
IL (secondary) = IP (secondary) * 1.732 = IL (load)
DELTA