You're about to purchase a battery. Normally, batteries are...

Name: Problem 77, Chapter 25: Essential University Physics
Uploaded: 2020-07-26T00:40:34-08:00
Duration: 1 min 7 s
Channel: Luis Rios
Description: You're about to purchase a battery. Normally, batteries are rated in ampere-hours- - the total charge they can deliver. Your application calls for a 5 - A -h battery. But the 6 -V battery you see while shopping online is rated at 50 watt-hours. Will it work?

You're about to purchase a battery. Normally, batteries are rated in ampere-hours- - the total charge they can deliver. Your application calls for a 5 - A -h battery. But the 6 -V battery you see while shopping online is rated at 50 watt-hours. Will it work?

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Battery Capacity Ratings

Battery capacity can be expressed in different units depending on whether the focus is on the charge available (ampere-hours) or the energy stored (watt-hours). Ampere-hour ratings measure the total charge a battery can deliver, while watt-hour ratings indicate the total energy. Understanding these ratings is critical for matching a battery's performance with the requirements of an application.

Unit Conversion between Watt-Hours and Ampere-Hours

Converting between watt-hours and ampere-hours involves the battery's voltage. The relationship is given by the formula: ampere-hours = watt-hours divided by the voltage. This conversion allows consumers to compare batteries rated in different units by relating the energy capacity to the electrical charge available for a specific voltage.

Application Requirements Versus Battery Specifications

When selecting a battery, it is essential to ensure that the battery's ratings meet or exceed the application's requirements, regardless of the units provided. Evaluating whether a battery's energy or charge capacity is sufficient involves converting and comparing these specific ratings to the demands of the intended use.

Transcript

Please give Ace some feedback