3 No. 7 batteries are connected in series and discharged at 200mA, how long can they be discharged?

ah ah is 1a per hour, which means a 1000mA battery that can be discharged at 1A for 1 hour, discharged at 500mA for 2 hours, and so on.

For example: 2000mA lithium battery with a load current of 1000mA then it can be used for 2 hours.

Example 2: 2000mA lithium battery 3 cells in series, total capacity 2000mA voltage, load 1000mA can be used for 2 hours.

Example 3; 2000mA lithium battery 3 cells in parallel, total capacity: 6000mA voltage, 1000mA load, can be used for 6 hours.

It looks like the parallel capacity has increased a lot but.

Example 4: Take Example 1 and Example 2 as the power supply Now prepare a motor A and a motor B

At this time, the current of motor A is the current of motor B, and the current of motor B is the law of conservation of energy, so the time that can be used is the same, and the power of the motor is also the same.

The requirements for the battery circuit in series are not high, and the requirements for parallel connection are very high. The series and parallel connection of batteries is generally set according to the needs of electrical appliances.

The capacity of the No. 7 alkaline battery is about 900mAh, and the series voltage is added together, and the capacity remains the same.

So: discharge time = 900 200 =

If the capacity of the paste, cardboard battery is lower than that of the alkaline battery, the discharge will not exceed that of the alkaline battery.

It depends on what you use, if it is installed in an electrical meter, water meter, doorbell or remote control, etc., it will be no problem to use it for a year; If it is used on a flashlight, the flashlight is often used up, and the short may be used up in three or five days or a week, and the long one may be used up in about a month.

Generally, the continuous work is about 2 hours, and the quiescent current is negligible.

It also depends on the battery level, and there are differences in different power levels.

Do you use four batteries in series or in parallel?

If you use a new battery and are fully charged, the discharge time is hours.

Lithium batteries also have a depth of discharge to consider.

First of all, it's 2v100mah, not 2v100ma.

Secondly, batteries of different voltages cannot be connected in parallel, and your parallel connection is equivalent to a short circuit to a 3V battery.

In the case of series connection, the sum of the voltages is equal to 5V, and the current depends on the load, and the current is 0 when the load is not connected

It should be calculated like this: if the capacity of a dry battery is 1000mAh, if the current of 200mA is used to discharge him, theoretically 1000 200 = 5h, but, in fact, the battery has internal resistance, the battery work, the internal resistance of the battery itself can not be ignored, when the power of the dry battery becomes less, its internal resistance gradually increases, when the new battery, assuming that the internal resistance is, then discharge with a current of 200mA, then the output voltage of the battery is only, at this time the internal resistance can not be counted, But when the internal resistance becomes 1r, then it can be seen from the above equation that the output voltage becomes, then the internal resistance of the battery itself can not be ignored, in life, when the battery used by the child's toy car can not be used, but the radio can also be used, the reason is that the toy car needs the current output of the battery is relatively large, assuming that it is 500mA, the current required by the radio is relatively small, assuming that it is 50mA, when the internal resistance becomes 1ohm after the battery is used, then the output voltage is calculated in two sections in series: toys:

Radio: (, From the above, it can be seen that the battery that the toy can not play can also be used on the radio, remote control and other products that consume little power, measuring the battery, capacity is an important parameter, internal resistance is also a very important parameter, of course, there are more I don't understand the important indicators, learning endlessly, haha.

Battery capacity, operating current, operating time

You have to look at the passenger standard (i.e. design) capacity of this No. 1 battery, the 200 you mentioned is the discharge rate, and it is in ma h!Therefore, to calculate the discharge time of a battery, you can directly divide the capacity by the discharge rate! Note that you are unable to discharge zero electromotive force, otherwise the power station pool will be broken!

It mainly depends on the type of battery you have, the current value of the protection board. If you use a portable battery, it is best not to discharge it at a high current, because it is not of this design.

Theoretically, it depends on the series value of the internal resistance of the battery and the load resistance. In fact, small capacity electricity often has a large internal resistance, and it is not easy to output large current.

Yes, but the voltage must be reduced with the impressed circuit method.

It takes more than 20 hours. If it shows that it is fully charged after 20 hours, the capacity of this battery is false. Many lithium batteries on the market, which claim to be more than 2000mAh, have far from reaching the actual capacity.

It should be pointed out that the current 200mA marked by the charger refers to the maximum current, not the real charging current, the actual charging current is less than 200mA, with 4000mAh 200mA = 20 h (hours), the calculation time of 20 hours is lower than the actual time that should be charged.