What does a battery’s amp-hour rating indicate?

What does a battery’s amp-hour rating indicate?

• A. The maximum voltage the battery can supply.
• B. The amount of energy storage capacity, expressed as delivering a given current for a specified period.
• C. The weight of the battery.
• D. The rate at which the battery recharges.

Answer: (B)

Amp-hour rating represents how much electrical charge a battery can store and deliver over time. It expresses capacity as the amount of current the battery can sustain for a certain period. For example, a 100 Ah battery can theoretically supply 10 A for about 10 hours (or 1 A for about 100 hours) at the specified discharge rate. In practice, the actual runtime depends on how fast you draw current (the discharge rate), temperature, and battery condition, so the Ah value is most accurate at the standard rate used for rating (often the 20-hour rate). This rating is about stored charge and runtime, not the voltage at a given moment, the weight of the battery, or how quickly it recharges. To get energy in watt-hours, multiply the amp-hours by the nominal voltage.

Amp-hour rating represents how much electrical charge a battery can store and deliver over time. It expresses capacity as the amount of current the battery can sustain for a certain period. For example, a 100 Ah battery can theoretically supply 10 A for about 10 hours (or 1 A for about 100 hours) at the specified discharge rate. In practice, the actual runtime depends on how fast you draw current (the discharge rate), temperature, and battery condition, so the Ah value is most accurate at the standard rate used for rating (often the 20-hour rate). This rating is about stored charge and runtime, not the voltage at a given moment, the weight of the battery, or how quickly it recharges. To get energy in watt-hours, multiply the amp-hours by the nominal voltage.