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How to measure a single on the 5th carbon battery capacity it? We find a nominal resistance bulb to measure. Turning on the circuit, the first battery terminal voltage measured U, then started very bright bulb, followed during battery discharge, the brightness of the bulb gradually become weaker and weaker. This shows that the battery voltage is slowly decreased over time. When the battery voltage drops to 0.75 volts, the brightness of the bulb has been very weak, and pretty soon the battery discharge stopped. During this period, we have regularly with a voltmeter to test out the U1, U2, U3, ...... Un such as voltage, and recorded. We refer to these voltage values measured with the time in a coordinate system shown, with one of them connected to each other point, then we get a curve Article, this Article curve is the voltage of said battery The function of the discharge time. So how can this Article according to the battery discharge curve to calculate the amp-hour capacity it? First first calculate the average operating voltage Um, second and then follow Ohm's law with a known constant load resistance Ra to calculate the average load Current Im (or discharge current): Im = Um / Ra, then you can obtain the amp-hour capacity.
Battery capacity is the battery discharge current and discharge time of the product. This number is the product of the capacity of the battery can output. We used Ah (ampere-hours, abbreviated Ah) to represent, but rarely used and then multiplied by the average voltage Wh (watt-hours) to represent. Battery discharge curve as we have seen on the map, the battery with a fixed resistance Ra is the discharge capacity of the geometry of the discharge of the area under the curve. This area is used mathematics definite integral approximation calculation trapezoid formula to solve.
Examples are as follows:
When the voltage of each test interval t = 2 hours,
Discharge time interval of the number n = 4 times
Each discharge the fixed load resistance Ra = 5Ω
Every time the total voltage were measured value: U = 1.5V, U1 = 1.1V, U2 = 1.0V, U3 = 0,9 V, U4 = 0.75V
We will then substituting these values into the formula to calculate trapezoid, can be drawn:
U + U1 + U2 + U3 + U4 = 5.25V
(U + U4) / 2 = 1.125V
Battery capacity = 2x (5.25-1.125) / 5 = 1.65 (Ah)
If we test voltage each time the time interval t as short selection, then the calculated values are more accurate battery capacity. This test method for alkaline manganese batteries is also applicable.
Battery capacity is the battery discharge current and discharge time of the product. This number is the product of the capacity of the battery can output. We used Ah (ampere-hours, abbreviated Ah) to represent, but rarely used and then multiplied by the average voltage Wh (watt-hours) to represent. Battery discharge curve as we have seen on the map, the battery with a fixed resistance Ra is the discharge capacity of the geometry of the discharge of the area under the curve. This area is used mathematics definite integral approximation calculation trapezoid formula to solve.
Examples are as follows:
When the voltage of each test interval t = 2 hours,
Discharge time interval of the number n = 4 times
Each discharge the fixed load resistance Ra = 5Ω
Every time the total voltage were measured value: U = 1.5V, U1 = 1.1V, U2 = 1.0V, U3 = 0,9 V, U4 = 0.75V
We will then substituting these values into the formula to calculate trapezoid, can be drawn:
U + U1 + U2 + U3 + U4 = 5.25V
(U + U4) / 2 = 1.125V
Battery capacity = 2x (5.25-1.125) / 5 = 1.65 (Ah)
If we test voltage each time the time interval t as short selection, then the calculated values are more accurate battery capacity. This test method for alkaline manganese batteries is also applicable.