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How to calculate a power in Electronic Devices

         Have noticed the amount of electricity your home on the electric bill? How figures can be formed and where they come from? The answer is easy, that is, from electronic devices used in the home. Such as lights, televisions, refrigerators, washing machines, fans etc..If we buy electronic devices, such as televisions, there are a lot of fine print is printed on a sticker on the back. One of the posts is more or less like this: POWER: 100 - 240V - 50/60Hz, 135 W. While on the power meter, there are some numbers that always ends with the words KWH, which stands for Kilo Watts per Hour. How is the relationship between Watts on electronic devices with Kilo Watts per Hour on the electric meter?
Assuming as an example of the information on the sticker on the back of the television was, how to calculate the amount of power used according to specifications are as follows.:

usage per minute: ((135/1000) x number of minutes) / 60
consumption per hour: 135/1000 x 1
usage per day: (135/1000) x number of hours
usage per month: ((135/1000) x the average number of hours per day) x 30



So, for the use of television for 8 hours / day, then the calculation as follows. :

usage per day: (135/1000) x 8 = 1.08 Kwh
usage per month: ((135/1000) x 8) x 30 = 32.4 Kwh
Assuming 1 month = 30 days


Unlike the fridge. While it takes a relatively small power consumption (average power consumption of 75 Watts), it takes a long time to work in a day is 24 hours. So the calculation is:

usage per day: (75/1000) x 24 = 1.8 Kwh per day

so usage per month: 1.8 x 30 days = 54 Kwh per month


In some electronic devices such as laptops, in addition to battery power source, use the adapter as the power input to be switched directly from a wall outlet. Big actual power consumed, not wittily INPUT OUTPUT as printed on the sticker attached to the adapter body.
For example:

INPUT: 100-240V ~ 1.6A 50/60Hz
OUTPUT: 19.0V - 4.74A 90W Max.

Power unit shown above using the unit Ampere. To find usage in units of Watts, the first must be converted using the formula:

Voltage x Amperes = Watts


Assuming the voltage is generally 220 volts, then the actual power consumption to operate directly from a wall outlet is:

220 Volts x 1.6 Amperes = 352 Watt

Thus, the calculation of power consumption:

usage per minute: (((352/1000) x number of minutes) / 60
consumption per hour: (352/1000) x 1
usage per day: (352/1000) x number of hours of use per day
usage per month: ((352/1000) x the average number of hours of use per day) x 30




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