How many kilowatt-hours does it take to charge a cell phone?

It's an interesting and boring question about how much power a phone needs to charge. Although many people may not care about the cost of a single charge, if you do ask how much it costs to charge your phone, most people may not be able to answer. Today's small series of digital bus in the spirit of exploring the unknown and chase the source of the phone charging the energy consumption calculation clearly, so that we do a clear consumer. Let's take a look at how much it costs to charge your phone.

Let's first explain a few nouns:

Ma:

Mah is the unit of measurement of current, denoted by the letter mA. Where ampere is the international unified current unit, represented by the letter A. It is also the metering point of the current mobile phone battery.

Wh:

Wh is electric quantity, which is proportional to voltage, current and time. MAh is usually used as the battery charge, discharge indicators, it is and the battery charge (discharge) current, time is proportional to the index, to make it and Wh have comparability or can be converted, but also must know the battery voltage.

3.7v lithium battery:

3.7v lithium battery is a lithium battery with a nominal voltage of 3.7v and a full voltage of 4.2v, with a capacity ranging from several hundred to several thousand mah.

Watt:

One kilowatt hour is equal to one kilowatt hour, which is the amount of electricity a 1,000-watt appliance consumes in an hour. That is, when we usually go to buy electricity said "a word" power.

Power loss:

This is determined according to the load at the end of the line, the problem of calculating the loss of the line is a professional problem in electrical calculation, he should consider the internal resistance of the line, the temperature of the service environment, cooling conditions, the distance of the line, the cross-sectional area of the wire, the type of load at the end, whether the inductive load or resistivity load, and so on. Since this part of the loss is very small, and it is difficult to complete the calculation, so here is ignored.

After reading the above content, we have a preliminary understanding of the unit of power consumption and consumption of mobile phone charging. Let's take a 2000 mah, 3.7v battery as an example and use the formula to calculate how much power it will take to charge it.

Formula: [V] times [ma]=Wh power consumption

Example calculation: 3.7VX2000 ma =7.4Wh (power consumption)

This gives us the battery's full charge without loss -- 7.4Wh, which translates to about 0.0074 KWH for our daily use.

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