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Calculating Electrical Measurements
 
The following are practical conversion equations to calculate the common electrical units of measure shown. If you have any questions or suggestions for more conversions, please call or email.
 
Calculating Current
Amperes/Amps (A)
amps=volts/ohms
amps=coulombs/(farads x ohms)
amps=watts/volts
amps=(watts x farads)/coulombs
amps=joules/(volts x seconds)
amps=joules/(coulombs x ohms)
amps=coulombs/seconds
amps=(farads x volts)/seconds
Calculating Potential
Volts (V)
volts=amps x ohms
volts=(coulombs x ohms)/seconds
volts=watts/amps
volts=(watts x seconds)/coulombs
volts=joules/(amps x seconds)
volts=joules/coulombs
volts=electrical horsepower/(amps x 746)
volts=mechanical horsepower/(amps x 745.6999)
volts=(electrical horsepower x seconds)/(coulombs x 746)
volts=(mechanical horsepower x seconds)/(coulombs x 745.6999)
volts=coulombs/farads
volts=(amps x seconds)/farads
Calculating Resistance
Ohms (Ω)
ohms=volts/amps
ohms=watts/amps2
ohms=joules/(amps2 x seconds)
ohms=electrical horsepower/(amps2 x 746)
ohms=mechanical horsepower/(amps2 x 745.6999)
Calculating Power
Watts (w)
watts=volts x amps
watts=volts2/ohms
watts=(volts2 x farads)/seconds
watts=amps2 x ohms
watts=(joules x amps)/coulombs
watts=(coulombs x amps)/farads
watts=(amps2 x seconds)/farads
watts=joules/seconds
watts=horsepower(E)/746
watts=horsepower(I)/745.6999
 
Electrical Horsepower/Horsepower(E) (hp(E))
horsepower(E)=watts x 746
horsepower(E)=volts x amps x 746
horsepower(E)=(volts2 x 746)/ohms
horsepower(E)=(volts2 x farads x 746)/seconds
horsepower(E)=amps2 x ohms x 746
horsepower(E)=(amps x joules x 746)/coulombs
horsepower(E)=(amps x coulombs x 746)/farads
horsepower(E)=(amps2 x seconds x 746)/farads
horsepower(E)=(joules x 746)/seconds
 
Mechanical/Imperial Horsepower/Horsepower(I) (hp(I))
horsepower(I)=watts x 745.6999
horsepower(I)=volts x amps x 745.6999
horsepower(I)=(volts2 x 745.6999)/ohms
horsepower(I)=(volts2 x farads x 745.6999)/seconds
horsepower(I)=amps2 x ohms x 745.6999
horsepower(I)=(amps x joules x 745.6999)/coulombs
horsepower(I)=(amps x coulombs x 745.6999)/farads
horsepower(I)=(amps2 x seconds x 745.6999)/farads
horsepower(I)=(joules x 745.6999)/seconds
Calculating Work
Joules (j)
joules=watts x seconds
joules=amps x volts x seconds
joules=(volts2 x seconds)/ohms
joules=volts2 x farads
joules=amps2 x ohms x seconds
joules=(coulombs x amps x seconds)/farads
joules=coulombs x volts
joules=kilowatt-hours x 3,600,000
 
Kilowatt-hours (kwh)
kilowatt-hours=watts x hours x 1,000
kilowatt-hours=(watts x seconds)/3,600,000
kilowatt-hours=volts x amps x hours x 1,000
kilowatt-hours=(volts x amps x seconds)/3,600,000
kilowatt-hours=volts2 x hours x 1,000/ohms
kilowatt-hours=(volts2 x seconds)/(ohms x 3,600,000)
kilowatt-hours=(volts2 x farads)/3,600,000
kilowatt-hours=amps2 x ohms x hours x 1,000
kilowatt-hours=(amps2 x ohms x seconds)/3,600,000
kilowatt-hours=(coulombs x amps x hours x 1,000)/farads
kilowatt-hours=(coulombs x amps x seconds)/(farads x 3,600,000)
kilowatt-hours=(electrical horsepower x hours x 1,000)/746
kilowatt-hours=(mechanical horsepower x hours x 1,000)/745.6999
kilowatt-hours=(electrical horsepower x seconds)/2,685,600,000
kilowatt-hours=(mechanical horsepower x seconds)/2,684,519,640
kilowatt-hours=joules/3,600,000
kilowatt-hours=(coulombs x volts)/3,600,000
Calculating Electrical Charge
Coulombs (c)
coulombs=amps x seconds
coulombs=(volts/ohms)seconds
coulombs=farads x volts
coulombs=joules/volts
coulombs=(watts x seconds)/volts
Calculating Capacitance
Farads (f)
farads=coulombs/volts
farads=coulombs/(amps x ohms)
farads=(coulombs x amps)/watts
farads=coulombs2/seconds
farads=(coulombs x amps x 746)/electrical horsepower
farads=(coulombs x amps x 745.6999)/mechanical horsepower
farads=(amps x seconds)/volts
farads=seconds/ohms
farads=(amps2 x seconds)/watts
farads=(amps x seconds)2/joules
farads=(amps2 x seconds x 746)/electrical horsepower
farads=(amps2 x seconds x 745.6999)/mechanical horsepower
Calculating Time
Seconds (s)
seconds=joules/watts
seconds=(joules x 746)/electrical horsepower
seconds=(joules x 745.6999)/mechanical horsepower
seconds=joules/(volts x amps)
seconds=(kilowatt-hours x 3,600,000)/watts
seconds=(coulombs x volts)/watts
seconds=(farads x volts2)/watts
seconds=coulombs/amps
seconds=(coulombs x ohms)/volts
seconds=(coulombs x volts)/watts
seconds=(farads x volts)/amps
seconds=joules/(volts x amps)
seconds=minutes x 60
seconds=hours x 3,600
seconds=days x 86,400
seconds=weeks x 604,800
 
Minutes (min.)
minutes=joules/watts
minutes=(joules x 746)/electrical horsepower
minutes=(joules x 745.6999)/mechanical horsepower
minutes=joules/(volts x amps)
minutes=(kilowatt-hours x 3,600,000)/watts
minutes=(coulombs x volts)/watts
minutes=(farads x volts2)/watts
minutes=coulombs/amps
minutes=(coulombs x ohms)/volts
minutes=(coulombs x volts)/watts
minutes=(farads x volts)/amps
minutes=joules/(volts x amps)
minutes=minutes x 60
minutes=hours x 3,600
minutes=days x 86,400
minutes=weeks x 604,800
 
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