Advice 1: How to convert kW to mW

Power is expressed not only in watts but also in derived units: micro - and milliwatts, kilowattsOh megawatts. The designation "mW" and "MW" not equivalent: the first refers to milliwatt and the second megawatt.
How to convert kW to mW
Instruction
1
If the designation "MW" first letter is uppercase, the problem is how to convert kilowatts to megawatts. One kilowatt is equal to one thousand watts, and one megawatt is a million watts, and that means one thousand kilowatts. Thus, to convert power expressed in kilowatts, to megawatts, divide the desired value by a thousand, for example:15 kW=(15/1000) MW=0.015 MW.
2
If the designation "mW" first letter is uppercase, the problem is how to convert kilowatts to milliwatts. One milliwatt is one thousandth of a watt, so that the capacity, expressed in kilowatts, convert to milliwatts, multiply the required quantity by one million, for example, 15 kW=(15*1000000) mW=15000000 mW.
3
Express power (and other physical quantities) in the wrong units without the need. Considered inappropriate units when expressing values which are too small or too large. Such numbers are inconvenient to carry out mathematical operations.
4
If the value still need to be expressed in the wrong units, use the exponential method of representing numbers. For example, the number 15000000 the previous example can be expressed as 1.5*10^7. In this form, the meaning of power or other quantities it is convenient to perform computations using a scientific calculator, which, in contrast to the conventional adapted for the representation of numbers.
5
If you solve a problem where at least some of the quantities (voltage, current, resistance, power, etc.) expressed in non-si units, first put all the data in SI (in particular, power in watts), and then solve the problem, and then translate the result into convenient units. If this is not done in advance, the determination of the order of the result and the units in which it is expressed, is much more complicated.

Advice 2: 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.
How to convert kilowatt hours to kilowatts
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).
3
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).
4
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 3: How to convert amps to kW

Amperes measure the strength of the electrical current in watts — electrical, thermal and mechanical capacity. Amps and watts in electrical engineering linked certain formulas, but because they measure different physical quantities, just put the amps in kW will not work. But it is possible different units to Express through others. Understand the correlation between current and power in electrical networks of various kinds.
How to convert amps to kW
You will need
  • tester;
  • - clamp;
  • - a Handbook on electrical engineering;
  • calculator.
Instruction
1
Measure with a tester the voltage of the network to which the connected appliance.
2
Measure using a clamp meter to the current value.
3
Voltage - permanent
Multiply the amount of current (amperes) the value of voltage (volts). The resulting work is the power in watts. For conversion to kilowatts you need to divide that number by 1000.
4
Voltage — single phase AC
Multiply the voltage by the amount of current and the cosine of the angle Phi (coefficient of power). The resulting work - consumed active power in watts. To translate that number into kilowatts divide it by a thousand.
5
The cosine of the angle between the full and active power in the triangle of capacity equal to the ratio of active power to the full. The angle Phi is sometimes called the phase shift between voltage and current - shift occurs in the presence of circuit inductance. Cos Phi equal to one if purely resistive loads (electric heaters, incandescent lamps), and about 0,85 — with a mixed load. The less reactive component of full power, the lower the loss, so the power factor are striving to improve.
6
Voltage — three-phase alternating
Multiply the voltage and current of one of the phases. Multiply the resulting value by the power factor. Similarly, calculated power of the other two phases. Then, all three phase power fold. The resulting amount will be the value of electrical power connected to three-phase network. With balanced load on all three phases active power is equal to the product, phase current, phase voltage and power factor multiplied by three.
Useful advice
Many electrical values of the power consumption or current are already specified in the instructions, on the case or packaging. Knowing the power you can transfer the amps into kilowatts, and you can perform the reverse action - that is, for known values of power and voltage to calculate current consumption.

There is an unwritten rule for AC, allowing to obtain approximate results when counting wires and choosing the starting-regulating equipment: the magnitude of the power equal to half the current value.
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