At what current drain does the ampere-hour Energizer d cell drop to 75% of its value at 25mA?
To find the current drain at which the ampere-hour (Ah) value of an Energizer D cell battery drops to 75% of its value at 25mA, we can use the formula:
Ah2 = Ah1 * (I1 / I2)
Where:
Ah1 is the initial Ah value at 25mA
Ah2 is the unknown Ah value at the desired current drain
I1 is the initial current drain (25mA)
I2 is the desired current drain (to be determined)
Let's assume the initial Ah value at 25mA is 1 Ah.
Using the given information, we can calculate the desired current drain as follows:
Ah2 = 1 Ah * (25mA / I2)
75% of the initial Ah value is 0.75 * 1 Ah = 0.75 Ah
0.75 Ah = 1 Ah * (25mA / I2)
Dividing both sides of the equation by 1 Ah gives:
0.75 = 25mA / I2
To solve for I2, we can rearrange the equation:
I2 = 25mA / 0.75
I2 ≈ 33.33mA
Therefore, the Ampere-hour Energizer D cell drops to 75% of its value at 25mA when the current drain is approximately 33.33mA.
To find the current drain at which the ampere-hour (Ah) Energizer D cell drops to 75% of its value at 25mA, we'll need to determine the initial Ah value at 25mA and then calculate the point at which it drops to 75% of that value.
1. Determine the initial Ah value at 25mA:
The Ah rating of a battery represents the total charge the battery can deliver over a specified time period. Let's assume the initial Ah rating of the Energizer D cell at 25mA is 10Ah.
2. Calculate the initial charge delivered at 25mA:
To calculate the initial charge delivered at 25mA, we can multiply the current drain (25mA) by the time (in hours) to get Ah.
charge at 25mA = (25mA × 1 hour) = 0.025Ah
3. Determine the point at which the Ah value drops to 75% of the initial value:
To find the current drain at which the Ah drops to 75% of the initial value, we can multiply the initial Ah value (10Ah) by 0.75.
0.75 × 10Ah = 7.5Ah
4. Calculate the time (in hours) it takes to deliver 7.5Ah at the unknown current drain:
To find the time it takes to deliver 7.5Ah at the unknown current drain, we can divide 7.5Ah by the unknown current drain in Amps (A) to get hours.
time = 7.5Ah ÷ unknown current drain
So, to find the current drain at which the Ah Energizer D cell drops to 75% of its value at 25mA, you would need additional information about the time it takes for the Ah to drop to 75% and then divide the remaining Ah (7.5Ah) by that time period.