give the formula for total power/watts

when you have I and E ?

P=I×E

E=√P×R

give the tdhe formula for total amps (I) , when you have:

E and R

I=E÷R

give  formula for resistance, when you hae values for

E and I 

R=E ÷I

give formula for I when you have values for:

P and R 

give formula for resistance when you have

E and P 

R=E²÷P

give formula for Amps when you have values for :

P and E 

I=P÷E

give power formula when you have values for 

I and R

P=I²×R

give formula for volts when you have 

P and I ?

what is fornula for volts when you have values for

I and R?

E=I×R

       INPUT WATTS       

V x A

state formula for:

single phase volt amp

E×I=1Ø volt amp

3Ø formula for V(olt)A(mps)

E×I×√3=3ØVA

VOLTDROP FORMULA :

1Ø

               2×K×I×L

VD=      CMA

OR,

VD=   2×L×I×R

           1OOO

VOLTDROP FORMULA :

3Ø

VD= √3×K×I×L

       CMA 

OR,

VD=  √3×L×I×R

       1000

K values for the constant of:

copper:

aluminum:

and where can be found ?

copper 12.9

aliminum 21.2

( chapter 9 table 8, 1000kcmil-uncoated-ohms/ft)

I = code letter off nameplate×HP×1000

VOLTS×√3

* code letter gives a value in kilovolt-amps {art.430.7(B) table} use highest value  *

formula short circuit fault current of transformer

FAULT CURRENT =

secondary rated amps ÷ 0/0 ×  Z

           746 × HP         

E x I x 1.732 x P.F.

     hp = V x I x Eff.     

746

1Ø =        KW x 1000      

        E 

3Ø =        KW x 1000      

         E  x P.F. 

•    D/C output HP ?

I x E x Eff.

746

HP output for a single phase voltage in an A/C circuit ?

3 Phase circuit ?

  1Ø  =   I x E x Eff. x  P.F.

746

3Ø  =  I x E x Eff x P.F. x 1.732

746

3Ø PF =  3Ø watts  

             3Ø VA

                            1Ø motor HP x 746 

1Ø Motor Eff.   =    E (line)x I(line)x PF

side opposite 

hypotenuse

side adjacent 

hypotenuse

side opposite 

side adjacent 

rt = r1 † r2 †  r3

RT = 1/R1  † 1/R2  † 1/R3

RT = PRODUST OF 2 RESISTORS 

SUM OR 2 RESISTORS

PYTHAGOREAN'S THEORM 

A² + B² = C²

R_{T =}product of two resistors

          sum of two resistors

R_{T =resistance value of resistors of equal value} 

       number of resistors of equal value 

X_{C =                   1}            

            2∏FL

volts = volt phase × √3

amps = I (line) = I (phase or coil )