all formulas in electricity
Answers
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Answer:
Volts (E):
Volts = square root of (watts x ohms)
Volts = watts / amperes
Volts = amperes x ohms
Ohms (R):
Ohms = volts / amperes
Ohms = volts² / watts
Ohms = watts / amperes²
Watts (W):
Watts = volts² / ohms
Watts = amperes² x ohms
Watts = volts x amperes
Amperes (I):
Amps = volts / ohms
Amps = watts / volts
Amps = square root of (watts / ohms)
AC Motor Formulas:
E = voltage / I = amps / W = watts / PF = power factor / Eff = efficiency / HP = horsepower
Single Phase:
Current (amps) I = HP x 746 (where hp is known)
E x Eff x PF
Current (amps) I = KW x 1000 (where KW is known)
E x PF
Current (amps) I = Kva x 1000 (where Kva is known)
E
Horsepower (hp) (hp) = I x E x Eff x PF
746
Kilowatts (KW) (KW) = I x E x PF
1000
Kilovolt-Amps (Kva) Kva = I x E
1000
Three Phase:
Current (amps) I = HP x 746 (where hp is known)
1.73 x E x Eff x PF
Current (amps) I = KW x 1000 (where KW is known)
1.73 x E x PF
Current (amps) I = Kva x 1000 (where Kva is known)
1.73 x E
Horsepower (hp) HP = 1.73 x I x E x Eff x PF (where hp is known)
746
Kilowatts (KW) WK = 1.73 x I x E x PF (where hp is known)
1000
Kilovolt-Amps (Kva) Kva = 1.73 x I x E (where hp is known)
1000
AC Efficiency and Power Factor Formulas:
Single Phase Efficiency: 746 x HP
E x I x PF
Single Phase Power Factor: Input Watts
V x A
Three Phase Efficiency: 746 x HP
E x I x PF x 1.732
Three Phase Power Factor: Input Watts
E x I x 1.732
Electrical Rules of Thumb:
Sync Speed Approx. Torque
rpm lb-ft per hp
3600 1.4
1800 3
1200 4.5
900 5.8
Rated Approximate Amps / hp
Voltage Single Phase Three Phase
115 10
230 5 2.5
460 1.25
575 1
Hope this helps u dude
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Answer:
Current I I = Q / t
Q = Charge
t = time taken
Amperes (A)
Voltage V V = E / Q
or
V = W / Q
E = Energy, W = Work done
Volts (V)
Resistance R R = ρl / A
ρ = Resistivity,
l = length,
A = Area
Ohm (Ω)
Resistance R R = V / I ohm (Ω)
Power P P = VI Watts (W)
Conductivity σ sigma = 1 / ρ Siemens per meter (S/m)