Battery capacity is commonly expressed in which unit?

Battery capacity is commonly expressed in which unit?

• A. Watts
• B. Amp-hours
• C. Watt-hours
• D. Volt-amperes

Answer: (B)

Battery capacity is the amount of charge a battery can deliver over time. For drone batteries, this is most commonly expressed in ampere-hours. It directly tells you how long the battery can run at a certain discharge current—e.g., a 5 Ah pack can supply 5 A for one hour, or 2 A for two-and-a-half hours. Watt-hours describe the total energy stored (calculated as voltage times Ah), so they depend on both capacity and voltage. Watts is instantaneous power, not capacity, and volt-amperes is used for AC apparent power and isn’t the standard measure for DC battery capacity. So ampere-hours is the best answer for capacity.

Battery capacity is the amount of charge a battery can deliver over time. For drone batteries, this is most commonly expressed in ampere-hours. It directly tells you how long the battery can run at a certain discharge current—e.g., a 5 Ah pack can supply 5 A for one hour, or 2 A for two-and-a-half hours. Watt-hours describe the total energy stored (calculated as voltage times Ah), so they depend on both capacity and voltage. Watts is instantaneous power, not capacity, and volt-amperes is used for AC apparent power and isn’t the standard measure for DC battery capacity. So ampere-hours is the best answer for capacity.