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When it comes to measuring the capacity of batteries, two common terms are frequently used: Wh and mAh. Wh, short for watt-hour, represents the amount of energy a battery can deliver over time, while mAh, or milliamp-hour, quantifies the charge capacity of a battery. Understanding these units is essential for gauging the performance and comparing different batteries. Moreover, being able to convert between Wh and mAh is useful when working with various electronic devices and power sources. In this article, we will explore what Wh and mAh are, and learn how to convert Wh to mAh and vice versa. By gaining a comprehensive understanding of these measurements and their conversion, we can effectively navigate the world of batteries and power management.
The two units of measurement mAh and Wh are frequently used to measure battery capacity on modern technology devices such as phones, laptops, etc. Surely you, have also heard of it, but to understand and correct it. To identify each type, let’s find out with Thptlaihoa.edu.vn through the article below.
What is the unit of measure Wh?
Wh (short for Watt hour ) also known as Watt/hour , is the unit used to measure the electrical energy consumed by the device in 1 hour . (first)
For example: A 10W power bank with a capacity of 10W, works for 3 hours. So the power consumption of the phone charger will be 10 x 3 = 30 (Wh)
What is the unit of measure mAh?
mAh, also known as milliamp hour , is the unit used to measure the charge of a battery. In fact, mAh is used to calculate the capacity (capacity to store electricity) of small batteries such as phone batteries, power banks,… (2)
Example: Your phone has a battery capacity of 5000 mAh, which means the battery will provide 1000 mA of current for your phone to use for 5 hours.
Formula to convert between mAh to Wh in reverse
Formula to convert mAh to Wh
For example: A phone battery with a capacity of 5000 mAh, operating at a voltage of 3V, then: Wh = 5000 x 3/1000 = 15 Wh.
Wh → mAh . conversion formula
For example: A battery with a rating of 16 Wh, operating at a voltage of 7V, is: mAh = (16 x 1000)/7 = 2280 mAh.
Difference between Wh and mAh
From the definition of Wh and mAh, we can easily see the difference between them:
- Wh is a unit used to measure electrical energy consumption, commonly used for laptop batteries
- mAh is a unit of measurement for the capacity of a phone’s battery to hold electricity.
In fact, measuring battery capacity in Wh is considered more accurate and is applied in many aspects of life (For example, the standard of electrical equipment allowed to be carried on an airplane).
When comparing two batteries with only mAh units, you need to make sure they operate at the same Volts . Otherwise, the results will be incorrect. However, some manufacturers sometimes do not announce the Volt level of the battery, which often causes confusion for customers.
For example: Phone A battery with 6000mAh capacity operates at 6V voltage, Phone B battery with 6000mAh capacity operates at 5V voltage.
Battery A: Wh = (6000 x 6)/1000 = 36 WhPin B: Wh = (6000 x 5)/1000 = 30 WhTa see that battery A has a larger capacity than battery B.
Reference source:
(1) Technology textbook 8/page 168
(2) Physics Textbook 7/page 66
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In conclusion, understanding the concepts of Wh (watt-hour) and mAh (milliampere-hour) is crucial for comprehending and manipulating energy and power measurements. Wh represents the amount of energy consumed or produced over a period of time, while mAh refers to the capacity of a battery to deliver a certain amount of current over a specific duration. Being able to convert between Wh and mAh is essential for various applications, particularly in the field of battery technology.
To convert Wh to mAh, one must consider the voltage of the system. By dividing the Wh value by the voltage in volts, and then multiplying it by 1000, one can obtain the amount of energy in milliwatt-hours (mWh). Then, by dividing the mWh value by the voltage in volts again, the result will be the capacity in milliampere-hours (mAh). On the other hand, converting mAh to Wh follows the reverse process. By multiplying the mAh value by the voltage in volts, and then dividing by 1000, one can achieve the energy in watt-hours (Wh).
It is important to note that these conversions are based on ideal conditions and do not consider the inefficiencies and losses that might occur during energy conversion or usage. Therefore, in practical scenarios, the attained values may not be entirely accurate. Despite this limitation, being familiar with the conversion process allows individuals to estimate and assess energy consumption, enabling efficient utilization and management of power resources.
Overall, comprehending the notions of Wh and mAh, along with the ability to convert between the two, empowers individuals to work with energy measurements effectively. This knowledge proves invaluable in various domains, including electronics, renewable energy systems, and the optimization of battery performance.
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