Basic Electrical Engineering: 2014

Friday, 17 October 2014

how to convert watts to kwh

How to convert watts to kwh

Electrical formulas

Kilowatt

The kilowatt-hour (symbolized kW⋅h) is a unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour. One watt is equal to 1 J/s.

Formulas :

Wh = watts * Time

kwh = watts * time

1000

kwh = kw * Time

kwh = 1000watts * 1 hours

Example :

What is the energy consumption in kwh when the power consumption in 7500 watts for the time

duration of 9 Hrs.

Given Data :

watts = 7500

Duration = 9 hrs

Formula :

kwh = watts * Time

1000

= 7500* 9

1000

= 67.5 kwh

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Saturday, 11 October 2014

how to calculate kwh kilowatt-hour

how to calculate kwh

Kilowatt-hour

The kilowatt-hour (symbolized kW⋅h) is a unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour. One watt is equal to 1 J/s.

Formula

KWH = watts (P) * time(T)

1000

KWH = P * T

1000

KWH = 1kw * 1 hr

Example :

a large ran motor rated at 4400 watts and you use it 5 hrs. a day to find consumed kwh /month.

Formula :

KWH = P * T
1000

~~Ans~~ :

Wattage = 4400

Usage per day = 5 hrs

= P * T
1000

= 4400* 5
1000

= 22000
1000

= 22 kw per day
Monthly

= 22kwh * 30 days

= 660 units per month

how to calculate kw in single phase system

How to calculate kw in single phase system

power (KW) = voltage (V) * current (I) * power factor (cos0)/ 1000

KW = V * I * COS0

1000

KW = Watts

1000

Example :

A large fan motor rated at 8 amps and operated at 220 v, 0.8 power factor leading to find kw.

Formula :

KW = V * I * COS0

1000

Answer :

KW = V * I * COS0

1000

= 220 * 8 * 0.8

1000

= 1.4 kw

how to calculate kva

KVA = kilo volt ampere

Kilo = 1000

KVA = volt * ampere

1000

KVA = V*I

1000

Example :

To find kva in high speed exhaust fan having 25 amps and operating volt at 420 volt .

Formula:

kva = v*i/1000

Answer :

= 420 * 25

1000

= 10.5 kva

how to calculate watts in a single phase system

Watts = power

watts = volt * ampere * power factor

watts = v * i * p.f

Example :

To find watts in single phase electric heater having 3.2 amps and operating at 230 V ,0.8 power factor .

Formula :

Watts(P) = V * I *P.F

= 230 * 3.2 * 0.8

P = 588 watts

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how to calculate VA

How to find VA (or) Volt ampere

VA = Volt ampere

VA = volt * ampere

VA = V*I

Example :

To find VA in Single phase 220 v , 5 A Air cooler.

V = 220 volts

A = 5 amps

Formula :

VA = V*I

= 220*5

VA = 1100 Volt ampere

Friday, 11 July 2014

how to calculate Watts to Amps

1. DC Voltage

I = P / V

Example:

P = 60
V = 12
I = 60W / 12V

I = 5A

2. Single phase voltage

I = P / (PF × V )

Example:
P = 920
P.F = 0.8
V = 230

I = 920W / ( 0.8 PF × 230V )

I = 5A

3. Three phase voltage

I = P / ( √3 × PF × V )

Example:

I = 2875.12 / ( √3 × 0.8PF ×415 V )

I = 2875.12 / 575.024

I = 5A

how to convert milliamps to Amps

How to convert milliamps to Amps

1A = 1000 mA

I = mA / 1000

Example:

mA = 5000

ampere I = ?

I = 5000mA / 1000

I = 5A

how to calculate Amps to milliamps

mA = A × 1000

Example:

A = 5
mA = ?
mA = 5 A × 1000

mA = 5000

How to calculate Ampere and voltage

1. single phase voltage

V = P / I

Example:

P = 115
I = 5

V = 1150P / 5I

V = 230V

2 . Three phase voltage

V = P / √3 × PF × A

Example:

P = 2875
I = 5
P>F= 0.8

V =2875.12 P / √3 ×0.8 PF ×5 A

V = 2875.12 / 6.928

V = 415V

how to calculate volt ampere VA in a singe and a three phase system

1. Single phase voltage

VA = I × V

Example:

I = 5
V = 230

VA =5 I × 230V

VA = 1150 VA

2. Three phase voltage

VA = √3 × I × V

Example:

I =5

V = 415

VA = √3 × 5I × 415V

VA = 3593.9

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how to calculate KVA in a single and a three phase system

1. Single phase voltage

KVA = I × V / 1000

Example:

I = 5
V=230

KVA =5 I ×230 V / 1000

KVA = 1.15 KVA

2. Three phase voltage

KVA = √3 × I × V / 1000

Example:

I= 5
V=415

KVA = √3 × 5I ×415 V / 1000

KVA = 7.1878 KVA

How to calculate kw in ac and dc

1. DC Voltage
Formula .
P = I × V / 1000

Example:

I = 5
V= 12
P =?

P =5I ×12V / 1000

P = 0.06KW

2. Single phase voltage

P = PF × A × V / 1000

Example:
P.F = 0.8
A = 5
V = 230
KW (P) = ?

P =0.8PF ×5 A × 230V / 1000
P= 0.92KW

3. Three phase voltage

P = PF × √3 × A × V / 1000

Example:

P.F = 0.8
A = 5
V = 415
P = ?
P = 0.8PF × √3 × 5A × 415V / 1000
P = 2.875 KW

how to convert amps to watts

1.DC voltage

P = I × V

ohm's law

P = E × I

P = R × I²

P= E² × R

Example:

12V     5A

P 12V × 5A      = 60W

P = R × I²

R = P / I²

R = 60W /   5²= 2.4

P = 2.4 × 5² = 60W

P= E² × R

P = 12² / 2.4      = 60W

2. Single phase voltage

P = PF × I × V

Example:

P = 0.8PF × 5A × 230V

P = 920W

3. Three phase voltage

P = √3 × PF × A × V

Example:

P = √3 ×0.8 PF ×5A ×415V

P = 2875.12W

Saturday, 5 July 2014

Electrical Formulas KVA , KW , KWh , V and I

HOW TO CALCULATE KVA

1. single phase

KVA = A * V / 1000

2. three phase

KVA =  √3 x V x A / 1000

HOW TO CALCULATE AMPS

1. single phase

A = KVA x 1000 / V

2. three phase

A = KVA x 1000 / √3  x V

HOW TO CALCULATE VOLTAGE

1. single phase

V = KVA x 1000 / A

2. three phase

V = KVA  x 1000 / √3  x A

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