# Advice 1: How to convert kW to kWh

In science and everyday life commonly used units of measurement of physical quantities like kilowatts, kilowatt-hours and hours. Each of these units corresponds to a specific physical parameter. Kilowatts measure power, in kilowatt-hours – the energy (work) and hours of time. In practice often we have to translate some values in others, for example, the power into energy. At the same time, it is also necessary to translate and the appropriate units – kWh per kW h. This translation is quite possible, if the time is known in advance or it can be calculated.
You will need
• a calculator or computer
Instruction
1
In order to convert kilowatts to kilowatt-hours (kW per kWh), verify that it is measured in kilowatts.

If the "kilowatt" was measured by a counter, and at the time of payment you are required to provide kilowatt-hours, then just fix kW per kW h. the Name "kilowatt" (kW) is often used in everyday life for the abbreviated name of a kilowatt-hour.
2
Sometimes kW per kWh must be translated to estimate how much energy the "wound" on the meter to the appliance for some time.

To calculate how many kilowatt-hours of energy will be spent by the device, multiply its capacity (in kW) and the time (in hours). If the power or the time given in other units before starting the calculations be sure to bring them to the above.
3
For example, if you want to know how much electricity will be used by the light bulb of power 100 W (watts) for half of the day, first turn the watts to kilowatts (100 watts = 0.1 kW) and night hours (0.5 days = 12 hours). Now, multiply the obtained values of power and time. Obtained: 0,1 * 12 = 1,2 (kWh).
4
Using the method described above, it is possible to estimate the power consumption of the entire apartment during the month (e.g. budget planning). Of course, you can just lay down power all the appliances and multiply this amount by the number of hours in the month (30 * 24 = 720). However, this way you will get a highly inflated estimate of power consumption. For more accurate calculations must take into account the actual average operation time of each appliance during one month, then multiply that time the capacity of this device, then put the energy usage of all devices.

For example, if one bulb 60W hanging in the entrance and reception, and the second, with 100 watts lights up the toilet and used about 1 hour a day, a month counter "cheat":

0,06 * 24 * 30 + 0,1 * 1 * 30 = 43,2 + 3 = 46,2 (kWh).

# Advice 2 : How to convert kilowatts

Kilowatt (kW) is a unit of power, i.e. relations work for the length of time for which it is made. However, the power can be measured in other units, and kilowatts, you can easily transfer to any of them by a simple multiplication method.
You will need
• Calculator or Converter
Instruction
1
Often in solving problems it is necessary to translate kilowatts in such units as joules per second (j/s). It is very simple, because one Joule / second equals one watt. Therefore, to convert kilowatts to joules per second, you just need to multiply them by 10 to the third power, i.e. a thousand. For example, 5 kW = 5 x 1000 = 5000 j/s.
2
Another common unit of power is horsepower (HP), but it is not included in the SI system. When translating kilowatts in this unit it is important to clarify what kind of horsepower you mean. In our country more often used metric horsepower. One kilowatt is approximately equal to 1.36 metric HP.. And in the US and partly in the UK under the horsepower refers to the horsepower of electric. One kilowatt is approximately 1.34 HP electric.. there is Also a so-called boiler horsepower. Kilowatt is approximately equal to 0.1 HP. boiler Thus, 5 kW x1 36 = 6,8 metric HP, as well as 5 kW x 1.34 = 6,7 electric HP and 5 kW x 0,1 = 0,5 boiler horsepower.
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In real life, often found this unit as kilocalories per hour (kcal/h). One kilowatt is approximately equal to 859,85 kcal/h. So, 5 kW can be translated in kilocalories per hour to the following: 5 kW x 859,85 = 4299,25 kcal/h.
4
If we are talking about the USA, in some case you can use the old British unit of power is ft-lb per second. Kilowatt is approximately equal to 737,56 ft-lb/s. So 5 kW = 5 x 737,56 = 3687.8 foot-pounds per second. There are a number of non-si units of power, in certain cases, used in the United States and Britain, but not typical for Russia. Translation of a kilowatt in such units can be realized with the help of online converters.
Remember that for translating kilowatts into watts, it is sufficient to multiply the number of kW per thousand (10 to the third power), and for the conversion of kilowatts to megawatts you need to divide this number a thousand (times 10 to the minus third power).
1 kW = 1000 W = 0.001 MW

# Advice 3 : How to convert kilowatt hours to kilowatts

When measurement or calculations of physical quantities using the appropriate units. To avoid mistakes, in solving problems or in practical computing all values usually result in a single system of measurement. When you need to translate the watts into kilowatts or hours to minutes, the questions usually arise. But when you want to translate kilowatt hours to kilowatts, additional information is needed.
You will need
• calculator.
Instruction
1
If you need to convert to kilowatts electricity readings, which are known, are measured in kilowatt-hours is likely to do to translate is not necessary. Just rewrite the numbers from the meter display. The fact that in everyday life, the kilowatt-hours are very often referred to simply kilowatts. Do not try to explain to older people that they are wrong. Just take household kilowatts as the shortened name of the kilowatt-hours.
2
To practice to translate kilowatt hours to kilowatts is necessary in cases when you need to measure the power of the appliance, and the necessary measuring instruments no. To know the power consumption of electric appliance, record the readings of the meter. Then disconnect all appliances, including refrigerator. Then plug in the device under test and switch it on. Note the time of inclusion and after an hour disconnect the appliance (including the fridge). Record the new readings of the meter and subtract from them the previous testimony. The difference would be number of kilowatt hours (the amount of power consumed by the device) and the number of kilowatt – power (in kilowatts).
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If you want kilowatts kilowatt hours not for an hour, and for any time period, use the following formula:RAC = Ccvc / KCH, where KKV is the number of kilowatts, Ccvc – the number of kilowatt-hours, CN is the number of hours (time during which measurements were taken).
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For example, it is necessary to determine the average power of all electrical appliances in the apartment during the day. To do this, simply make a note of the meter readings and the time at which these readings were taken. Then exactly one day again take readings of the meter. The difference between the two readings will equal the number of kilowatt-hours. In order to translate these kilowatt hours to kilowatts, divide that number by 24 (number of hours per day) and get the average daily power consumption.

# Advice 4 : How to translate W/in the hour W

When calculating the amount of electricity consumed, it is customary to use the term "kilowatt-hours". This value is the actual power consumption device power N kilowatt a number of hours X.
Instruction
1
Start to understand what kind of value you need to take into consideration. The fact that very often in the calculation of electricity the concept of kilowatt-hours and kilowatts are confusing. Although kW is power (that is, the amount consumed by the device of energy) and kilowatt-hour is the amount of time consumed per hour.
2
Please note that the data on energy consumed on the electric counter indicated in kilowatts. To convert them into watts, multiply the number of kilowatt one thousand. Thus, 1 kilowatt * 1000 = 1000 watts.
3
As watt-hours or kilowatt-hours is the amount of watts for a certain period of time, for calculations you must know for what period of time to get the figure. Divide the number of watt-hours by the number of hours for which the calculation is performed.
4
For example, you know that in the past month (30 days) consumption of electricity metering devices is 72 kilowatt/hours. Multiply this figure by a thousand. To obtain the number of watts. 68,4*1000=68400 watts/hour. Now divide the resulting figure by 720. That's the number of hours in one month (30*24=720). 68400/720=95 watts. It turns out that in the course of a month constantly burning one light bulb with a power of 95 watts.
5
Remember that the data remain approximate average character, if you produce a General calculation. It is impossible to distinguish one particular appliance. This formula does not take into account the loss of energy. To calculate power watts for a single device you need to connect it to the network in a single copy, included leaving within the hour. The resulting figure will be the desired value. For example, if the network was enabled iron. Potrebu one hour 1500 watt/hour, power consumption of this device would be exactly 1500 watts.

# Advice 5 : What is measured by the energy

In the so-called International system of units of work, heat and energy are measured and denoted in joules. This name unit of measure was due to the work of the English physicist James Prescott Joule. Meanwhile, in certain areas of expertise to measure the energy used calories.
James Joule developed and modified Newton's laws, which played an important role in determining the types of mechanical energy. In particular, he showed that heat is a form of energy.

## The relationship between force and energy

To understand what a Joule, you must first apply to the definition of unit of force Newton. A Newton is the force that can accelerate a 1 kg mass at a speed of 1 meter per second. Joule is the amount of energy consumed or work. So, 1 Joule is equal to consumed power of 1 Newton.

## Power and energy

When it comes to devices that people use at home, usually nobody cares how much the device consumes energy per second. More importantly, the speed with which the device picks up the energy per unit time. This value is called "power". It can be represented by the formula:

Power = energy/time

In particular, the variation of power is electricity. It is measured in wattH. Watt is a unit of power, named after the scientist James watt. The ratio of the watt and the Joule can be expressed by the formula:

1 watt = 1 Joule/1 second

Though energy and power are closely related, they should not be confused. It is important to understand that power is the rate of absorbed energy and not the amount of energy. Resorting to the help of algebra, we can Express the energy of a simple equation:

Energy = power *time

Based on the foregoing, it can be argued that light bulb with a power of 100 watt is a device that converts 100 joules of electrical energy into 100 joules of electromagnetic radiation (or light) every second. If you do not repay a lamp for one hour, then the energy that it absorbs, is equal to 360000 joules. It can be shown in equation:

Energy = power*time= 100 j./sec. * 3600 seconds = 360000 joules

Watts is a convenient unit of measurement when it comes to appliances. For example, they can be used to determine the lamp power. But there are times when it is important to know the consumption of energy in General. For example, you need to calculate how much you will have to pay for electricity according to the receipt. In practice, for calculating the energy use joules as the unit of measurement is not very convenient. Then using another unit is kilowatt per hour. 1 kilowatt hour of energy equal to 1000 watts of power absorbed per 60 minutes. About as much energy goes to conventional hair dryer for one hour.
The energy measurement is also used amps and volts. Volt is a unit of measurement of a particular energy. Using amperes measure electric current.

## Calories and joules

Energy can also be measured in calories. Calories, usually associated with food. But they can be used for measurement of other types of energy. 1 calorie equal to 4 184 joules.
If you want to consume 1 liter of gasoline will require 7 750 000 calories.

The calories that you see on packages of food is, in fact, kilocalories. In one kilocalorie contains 1000 calories.
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