The conversion of 7.4 Wh to mAh results in approximately 7400 mAh. This means that 7.4 watt-hours of energy is equivalent to about 7400 milliamp-hours when considering a voltage of 1 volt.
To understand this, remember that watt-hours measure energy, while milliamp-hours measure charge. The formula to convert Wh to mAh involves dividing the watt-hours by voltage (in volts) and multiplying by 1000 to get milliamp-hours. For example, if voltage is 1V, then 7.4 Wh equals 7400 mAh.
Conversion Formula
The formula to convert watt-hours (Wh) into milliamp-hours (mAh) is: (Wh / Voltage) * 1000 = mAh. This works because watt-hours are a measure of energy, which is voltage times charge, so dividing energy by voltage gives charge in amp-hours. Multiplying by 1000 converts amp-hours to milliamp-hours. For instance, if the voltage is 1V, then 7.4 Wh divided by 1V is 7.4 Ah, which equals 7400 mAh.
Conversion Example
- Suppose you have 15 Wh and a device voltage of 3.7V.
- – Step 1: Divide 15 Wh by 3.7V: 15 / 3.7 ≈ 4.054 Ah.
- – Step 2: Convert Ah to mAh by multiplying by 1000: 4.054 * 1000 ≈ 4054 mAh.
- – Thus, 15 Wh at 3.7V is approximately 4054 mAh.
- If you want to convert 10 Wh at 5V:
- – Step 1: 10 / 5 = 2 Ah.
- – Step 2: 2 * 1000 = 2000 mAh.
- – So, 10 Wh at 5V equals 2000 mAh.
- For 20 Wh at 2V:
- – Step 1: 20 / 2 = 10 Ah.
- – Step 2: 10 * 1000 = 10,000 mAh.
- – Therefore, 20 Wh at 2V is 10,000 mAh.
Conversion Chart
| Wh | mAh (at 1V) |
|---|---|
| -17.6 | -17,600 |
| -12.4 | -12,400 |
| -7.4 | -7,400 |
| -2.2 | -2,200 |
| 2.4 | 2,400 |
| 7.4 | 7,400 |
| 12.4 | 12,400 |
| 17.6 | 17,600 |
| 22.8 | 22,800 |
| 27.4 | 27,400 |
| 32.4 | 32,400 |
This chart helps you quickly see the approximate mAh values for different watt-hours at 1V, making it easier to estimate conversions without calculator use.
Related Conversion Questions
- How many mAh are in 7.4 Wh if my device voltage is 3.7V?
- What is the mAh equivalent for 7.4 watt-hours at 5 volts?
- Can I convert 7.4 Wh to mAh for a 12V battery?
- What does 7.4 Wh mean in terms of milliamp-hours for a 1.5V battery?
- How do I convert watt-hours to milliamp-hours for different voltages?
- Is 7.4 Wh equal to 7400 mAh at 1V?
- How many milliamp-hours are in 7.4 Wh at 3V?
Conversion Definitions
“Wh” (watt-hour) is a unit of energy representing the amount of work done or energy transferred when one watt of power is used for one hour. It measures total energy capacity of batteries or power sources in a broad sense.
“mAh” (milliamp-hour) measures the charge capacity of a battery, indicating how many milliamps can be supplied over one hour. It helps compare how long devices can run before needing recharge, based on current draw and capacity.
Conversion FAQs
How does voltage affect the conversion of Wh to mAh?
The voltage directly influences the conversion because watt-hours divided by voltage gives amp-hours. Higher voltage results in fewer mAh for the same Wh, while lower voltage increases the mAh value, making the voltage a critical factor in calculations.
Can I use a standard voltage for all conversions?
No, because batteries and devices operate at different voltages. To get accurate mAh, you need to know the specific voltage of the battery or device in question. Using a generic voltage like 1V simplifies the process but might not reflect actual capacity.
What if I only know watt-hours but not the voltage?
If voltage is unknown, you cannot precisely convert Wh to mAh. You need the voltage value because the relationship between energy and charge depends on it. Without voltage, only energy in Wh can be compared, not charge in mAh.
Is the conversion different for rechargeable vs. non-rechargeable batteries?
The conversion formula remains the same, but actual capacity may vary due to chemical properties, efficiency, and usage conditions. Rechargeable batteries often have specifications listed in both Wh and mAh, aiding conversion.