To calculate how long a 27 Watt cooling fan will run on a 30000 mAh power bank

 To calculate how long a 27 Watt cooling fan will run on a 30000 mAh power bank, you can use the following formula:

Time (hours) = Battery Capacity (mAh) / Device Power (mAh)

First, you need to convert the power bank's capacity from mAh to Wh (Watt-hours) because the fan's power is given in Watts.

Battery Capacity (Wh) = Battery Capacity (mAh) / 1000 * Battery Voltage

Assuming the power bank voltage is around 3.7V (common for lithium-ion batteries), you can calculate the Wh as follows:

Battery Capacity (Wh) = 30000 mAh / 1000 * 3.7V = 111 Wh

Now you can calculate the runtime of the fan:

Time (hours) = 111 Wh / 27 Watts ≈ 4.11 hours

So, the power bank will take approximately 4.11 hours to go from 100% to 0% when powering the 27 Watt cooling fan continuously. Keep in mind that this is a theoretical estimate, and actual runtime may vary depending on factors like the efficiency of the power bank and the fan.  

proof of 1 hp = 746 watts

    Proof of 1 hp equal to 746 watts

HP = Horsepower 

    HP and Watts are both units of power. Power can be electric or mechanical, and can be converted between the two. Any conversion will be less than 100 % efficient.

It is only for historic reasons that electrical power is measured in Watts not hp, like the way that tyre widths are in mm but rim diameter are in inches.

One pound is 4.44822 Newtons

so 550 foot pounds per seconds, converted to metric, is 550 x 0.3048 x 4.44822 Newton meters per second, which is 745.7 Newton meters per second, better known as Watts.

One foot is 0.3048 metres

1HP = 550 Foot Pound per second 

1 Pound = 4.44822 Newtons

1 Foot is 0.3048 Meters.

1 HP = 550 * 4.44822 * 0.3048 meters

1Hp = 745.69 Newton meter per second. 

A 1 hp motor cannot use less than 745.7 Watts so if it uses 1 kW it is about 75% efficient, which sounds about right for a motor of that size.

One mechanical horsepower of 550 foot-pounds per second is equivalent to 745.7 watts. 

* A metric horsepower of 75 kgf-m per second is equivalent to 735.499 watts. 

* A boiler horsepower is used for rating steam boilers and is equivalent to 34.5 pounds of water evaporated per hour at 212 degrees Fahrenheit, or 9,809.5 watts. 

* One horsepower for rating electric motors is equal to 746 watts.

* A Pferdestärke is a name for a group of similar power measurements used in Germany around the end of the 19th century, all of about one metric horsepower in size.

* An RAC horsepower or British tax horsepower is an estimate based on several engine dimensions.

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how to convert kw to watts - electrical formulas

how to convert kw to watts 

click here to watch how to convert kilowatts to watts.

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2. how to work earth leakage circuit breaker -ELCB

3. faraday's law of electromagnetism

how to calculate single phase transformers primary and secondary full load current

How to calculate single phase transformer primary and secondary full load current



Watch this video.

 1. how to calculate single phase transformer secondary full load current

2. how to work earth leakage circuit breaker -ELCB

3. faraday's law of electromagnetism

how to calculate single phase transformer full load secondary current

    How to convert single phase transformer full load  secondary current

watch this video.

 1. how to calculate single phase transformer secondary full load current

2. how to work earth leakage circuit breaker -ELCB

3. faraday's law of electromagnetism

how to convert joule to watts - electrical formulas

   How to convert joule to watts  - electrical formulas

how to convert volt ampere to kilo watts - electrical formulas

how to convert volt ampere to kilo watts - electrical formulas 

watch this video 

how to calculate single phase transformer secondary full load current

how to convert volt ampere to watts - electrical formulas

how to convert volt ampere to watts - electrical formulas 

click here to watch this video ; how to convert volt ampere to watts

  

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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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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

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

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 

how to convert Watts to Amps

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

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

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

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

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