Electrical Circuit Current & Voltage Theory Part-1

Basic Electrical Theory  Ohm’s Law, Current, Circuits & More

Symbolic Option :

E =VOLTS ~or~ (V = VOLTS)

P =WATTS ~or~ (W = WATTS)

R = OHMS ~or~ (R = RESISTANCE)

I =AMPERES ~or~ (A = AMPERES)

HP = HORSEPOWER

PF = POWER FACTOR

kW = KILOWATTS

kWh = KILOWATT HOUR

VA = VOLT-AMPERES

kVA = KILOVOLT-AMPERES

C = CAPACITANCE

EFF = EFFICIENCY (expressed as a decimal)


DIRECT CURRENT (DC)

AMPS=

WATTS÷VOLTS

I = P ÷ E

A = W ÷ V

WATTS=

VOLTS x AMPS

P = E x I

W = V x A

VOLTS=

WATTS ÷ AMPS

E = P ÷ I

V = W ÷ A

HORSEPOWER=

(V x A x EFF)÷746

 

 

EFFICIENCY=

(746 x HP)÷(V x A)

 

 



AC SINGLE PHASE ~ 1ø

AMPS=

WATTS÷(VOLTS x PF)

I=P÷(E x PF)

A=W÷(V x PF)

WATTS=

VOLTS x AMPS x PF

P=E x I x PF

W=V x A x PF

VOLTS=

WATTS÷AMPS

E=P÷I

V=W÷A

VOLT-AMPS=

VOLTS x AMPS

VA=E x I

VA=V x A

HORSEPOWER=

(V x A x EFF x PF)÷746

 

 

POWERFACTOR=

INPUT WATTS÷(V x A)

 

EFFICIENCY=

(746 x HP)÷(V x A x PF)

 

 

AC THREE PHASE ~ 3ø

AMPS=

WATTS÷(1.732 x VOLTS x PF)

I = P÷(1.732 x E x PF)

WATTS=

1.732 x VOLTS x AMPS x PF

P = 1.732 x E x I x PF

VOLTS=

WATTS÷AMPS

E=P÷I

VOLT-AMPS=

1.732 x VOLTS x AMPS

VA=1.732 x E x I

HORSEPOWER=

(1.732 x V x A x EFF x PF)÷746

 

POWERFACTOR=

INPUT WATTS÷(1.732 x V x A)

 

EFFICIENCY=

(746 x HP)÷(1.732 x V x A x PF)

 

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