Electrical Calculation formula

Volt -V

Volt definition

Volt is the electrical unit of voltage or potential difference (symbol: V).
One Volt is defined as energy consumption of one joule per electric charge of one coulomb.
1V = 1J/C
One volt is equal to current of 1 amp times resistance of 1 ohm:
1V = 1A • 1Ω
Alessandro Volta
The Volt unit is named after Alessandro Volta, an Italian physicist who invented an electric battery.

Volts to watts conversion

The power in watts (W) is equal to the voltage in volts (V) times the current in amps (A):
watts (W) = volts (V) × amps (A)

Volts to amps conversion

The current in amps (A) is equal to the voltage in volts (V) divided by the resistance in ohms (Ω):
amps (A) = volts (V) / ohms(Ω)
The current in amps (A) is equal to the power in watts (W) divided by the voltage in volts (V):
amps (A) = watts (W) / volts (V)

Ampere -I

Ampere definition

Ampere or amp (symbol: A) is the unit of electrical current.
The Ampere unit is named after Andre-Marie Ampere, from France.
One Ampere is defined as the current that flows with electric charge of one Coulomb per second.
1 A = 1 C/s

Ampere meter

Ampere meter or ammeter is an electrical instrument that is used to measure electrical current in amperes.
When we want to measure the electrical current on the load, the ampere-meter is connected in series to the load.
The resistance of the ampere-meter is near zero, so it will not affect the measured circuit.

How to convert amps to kilo amps (kA)

The current I in kilo amperes (mA) is equal to the current I in amperes (A) times 1000:
I(kA) = I(A) • 1000

How to convert amps to watts (W)

The power P in watts (W) is equal to the current I in amps (A) times the voltage V in volts (V):
P(W) = I(A) • V(V)

How to convert amps to volts (V)

The voltage V in volts (V) is equal to the power P in watts (W) divided by the current I in amperes (A):
V(V) = P(W) / I(A)
The voltage V in volts (V) is equal to the current I in amperes (A) times the resistance R in ohms (Ω):
V(V) = I(A) • R(Ω)

How to convert amps to ohms (Ω)

The resistance R in ohms (Ω) is equal to the voltage V in volts (V) divided by the current I in amperes (A): R(Ω) = V(V) / I(A)

How to convert amps to kilowatts (kW)

The power P in kilowatts (kW) is equal to the current I in amps (A) times the voltage V in volts (V) divided by 1000:
P(kW) = I(A) • V(V) / 1000

How to convert amps to kilovolt-ampere (kVA)

The apparent power S in kilovolt-amps (kVA) is equal to RMS current IRMS in amps (A), times the RMS voltage VRMS in volts (V), divided by 1000:
S(kVA) = IRMS(A) • VRMS(V) / 1000

Watt (W)

Watt definition

Watt is the unit of power (symbol: W).
The watt unit is named after James Watt, the inventor of the steam engine.
One watt is defined as the energy consumption rate of one joule per second.
1W = 1J / 1s
One watt is also defined as the current flow of one ampere with voltage of one volt.
1W = 1V × 1A

How to convert watts to kilowatts

The power P in kilowatts (kW) is equal to the power P in watts (W) divided by 1000:
P(kW) = P(W) / 1000

How to convert watts to amps

The current I in ampers (A) is equal to the power P in watts (W) divided by the voltage V in volts (V):
I(A) = P(W) / V(V)

How to convert watts to volts

The voltage V in volts (V) is equal to the power P in watts (W) divided by the current I in ampers (A):
V(V) = P(W) / I(A)

How to convert watts to horsepower

P(HP) = P(W) / 746

How to convert watts to kVA

The real power P in watts (W) is equal to 1000 times the apparent power S in kilo-volt-amperes (kVA) times the power factor (PF) or cosine of the phase angle φ:
P(W) = 1000 • S(kVA) • PF = 1000 • S(kVA) • cos φ

How to convert watts to VA

The real power P in watts (W) is equal to the apparent power S in volt-amperes (VA) times the power factor (PF) or cosine of the phase angle φ:
P(W) = S(VA) • PF = S(VA) • cos φ

Farad (F)

Farad is the unit of capacitance. It is named after Michael Faraday.
The farad measures how much electric charge is accumulated on the capacitor.
1 farad is the capacitance of a capacitor that has charge of 1 coulomb when applied voltage drop of 1 volt
1F = 1C / 1V 

What is kilowatt (kW)?

Kilowatt (symbol: kW) is a unit of electric power.

Kilowatt definition

One kilowatt (kW) is equal to 1000 watts (W):
1kW = 1000W
One kilowatt is defined as energy consumption of 1000 joules for 1 second:
1kW = 1000J / 1s
One kilowatt is equal to 1000000 milliwatts:
1kW = 1000000mW

What is kilowatt-hour (kWh)

Kilowatt-hour definition

Kilowatt-hour is an energy unit (symbol kWh or kW•h).
One kilowatt-hour is defined as the energy consumed by power consumption of 1kW during 1 hour:
1 kWh = 1kW • 1h
One kilowatt-hour is equal to 3.6•106 joules: 1 kWh = 3.6•106 J The energy E in kilowatt-hour (kWh) is equal to the power P in kilowatts (kW), times the time t in hours (h).
E(kWh) = P(kW) • t(h)

Kilowatt-hour example

For example what is the energy consumed when consuming 2kW for 3 hours? Solution:
E(kWh) = 2kW • 3h = 6kWh

Kilowatt examples

Example #1
What is the power consumption in kW when energy of 30000 joules was released during 10 seconds?
Solution: P(kW) = 30000J / 10s / 1000 = 3kW
Example #2 What is the power consumption when consuming 6kWh for 3 hours? Solution:
 P(kW) = 6kWh / 3h = 2kW

kWh meter

kWh meter is the electric meter that measures the amount of electrical energy in kWh that was consumed in the house. The kWh meter has a counter display that counts units of kilowatt-hour (kWh). The energy consumption is calculated by calculating the difference of the counter's reading in the specified period.

Cost of electricity bill

The cost of electricity bill is calculated by multiplying the number of kWh that were consumed by the cost of 1kWh.
For example, the electricity bill's cost for consumption of 9000 kWh per month with cost of Rs.7.50/= for 1kWh is
9000 kWh x Rs.7.50/= Rs. 67,500/=.

Amps to kilowatts calculator

Amps (A) to kilowatts (kW) calculator.

AC single phase amps to kilowatts calculation

The power P in kilowatts (kW) is equal to the power factor PF times the current I in amps (A), times the RMS voltage V in volts (V) divided by 1000:
P(kW) = PF × I(A) × V(V) / 1000

AC three phase amps to kilowatts calculation

The power P in kilowatts (kW) is equal to square root of 3 times the power factor FP times the current I in amps (A), times the line to line RMS voltage VL-L in volts (V) divided by 1000:
P(kW) = √3 × PF × I(A) × VL-L (V) / 1000

Amps to kVA calculator

Amps (A) to kilovolt-amps (kVA) calculator. Enter phase number, the current in amps, the voltage in volts and press the Calculate button to get the apparent power in kilovolt-amps:

Single phase amps to kVA calculation formula

The apparent power S in kilovolt-amps is equal to current I in amps, times the voltage V in volts, divided by 1000:
S(kVA) = I(A) × V(V) / 1000

3 phase amps to kVA calculation formula

Calculation with line to line voltage
The apparent power S in kilovolt-amps is equal to current I in amps, times the line to line voltage VL-L in volts, divided by 1000:
S(kVA) = √3 × I(A) × VL-L(V) / 1000

Calculation with line to neutral voltage

The apparent power S in kilovolt-amps is equal to current I in amps, times the line to line voltage VL-N in volts, divided by 1000:
S(kVA) = 3 × I(A) × VL-N(V) / 1000

Amps to VA calculator

Amps (A) to volt-amps (VA) calculator and how to calculate. Enter phase number, the current in amps, the voltage in volts and press the Calculate button, to get the apparent power in volt-amps:

Single phase amps to VA calculation formula

The apparent power S in volt-amps is equal to current I in amps, times the voltage V in volts:
S(VA) = I(A) × V(V)

3 phase amps to VA calculation formula

The apparent power S in kilovolt-amps is equal to square root if 3 current I in amps, times the line to line voltage VL-L in volts:
S(VA) = √3 × I(A) × VL-L(V) = 3 × I(A) × VL-N(V)

Amps to volts calculator

Amps (A) to volts (V) calculator.
Select calculation type, enter amps and watts or ohms and press the Calculate button to get volts:

Amps to volts calculation

The voltage V in volts (V) is equal to the power P in watts (W), divided by the current I in amps (A):
V(V) = P(W) / I(A)
The voltage V in volts (V) is equal to the power P in watts (W), divided by the current I in amps (A):
V(V) = I(A) × R(Ω)

Amps to watts calculator

Electric current in amps (A) to electric power in watts (W) calculator. Select current type, enter current in amps, voltage in volts, power factor for AC circuit and press the Calculate button (DC = Direct Current, AC = Alternating Current):

DC amps to watts calculation

The power P in watts (W) is equal to the current I in amps (A), times the voltage V in volts (V): P(W) = I(A) × V(V)

AC single phase amps to watts calculation The power P in watts (W) is equal to the power factor PF times the current I in amps (A), times the RMS voltage V in volts (V): P(W) = PF × I(A) × V(V)

AC three phase amps to watts calculation The power P in watts (W) is equal to square root of 3 times the power factor FP times the current I in amps (A), times the line to line RMS voltage VL-L in volts (V): P(W) = √3 × PF × I(A) × VL-L(V)

Power factor calculator

Three Phase circuit calculation

KWh/KVAh = PF %

Single phase circuit calculation

PF = |cos φ| = 1000 × P(kW) / (V(V) × I(A))

Three phase circuit calculation

Calculation with line to line voltage

PF = |cos φ| = 1000 × P(kW) / (√3 × VL-L(V) × I(A))

Calculation with line to neutral voltage

PF = |cos φ| = 1000 × P(kW) / (3 × VL-N(V) × I(A))

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