1688
How is the power of a battery calculated
1. MAh “is a unit of battery capacity, known in Chinese as milliampere hour (for the convenience of measuring large capacity batteries such as lead-acid batteries,” Ah “is generally used, and the Chinese name is ampere hour).
1mAh=0.001 ampere * 3600 seconds=3.6 ampere seconds=3.6 coulombs
2. Coulomb is a unit of electricity, not a basic unit of the International System of Units, but a special unit of the International System of Units. 1 coulomb equals 1 ampere second.
The amount of electricity transported within 1 second with a current of 1A, i.e. 1C=1A · s.
3. Power calculation formula: P=UI. The unit of P is watts W; in a pure resistance circuit, according to Ohm’s law, U=IR can be substituted into P=UI to obtain: P=I * IR=(U * U)/R
1、 The most direct algorithm:
1. First, obtain the current of the electrical equipment
2. The usable duration is obtained by dividing the battery capacity by the current of the electrical device
For example:
A 3000mAH battery with a rated voltage of 5V supplies power to an electrical device with a power consumption of 2.5W and a voltage of 5V. Its theoretical usage duration is:
I=P/U=>2.5w/5v=>0.5A=>500MA
3000mAh, 3000MA current can discharge for one hour,
3000/500=6 hours
2、 Using the Coulomb algorithm for charge quantity
C=IS=>3A * 3600s=>10800c Coulomb (charge)
10800c * 5v=54000w electrical energy
54000w/2.5w=21600/3600s=6h
