Computer Hope

Other => Other => Topic started by: John1397 on October 30, 2011, 06:06:29 PM

Title: How many hours LED burn
Post by: John1397 on October 30, 2011, 06:06:29 PM

How many hours will a 20ma led burn on a AA battery rated at 700?

John

Title: Re: How many hours LED burn
Post by: Geek-9pm on October 30, 2011, 06:29:05 PM

Is this homework?

The battery is not rated for constant drain. The book says that it normally is used only a few hours each day.

Read you assignment carefully. The 700 bis 700 milliamp hours.
That can mean either 700 milliamps for one hour, or one milliamp for 700 hours. It is a product.

Milliamp Hours.
http://en.wikipedia.org/wiki/Ampere-hour
From the above link you can deduce that Milli Amp hour is the product of milliamps multiplied by the number of hours the battery can last in intermittent service.

Title: Re: How many hours LED burn
Post by: madcaddies on November 04, 2011, 02:03:01 PM

dunno much about led technology but one product i have claims 50k hours of operating time before burning out.

Title: Re: How many hours LED burn
Post by: patio on November 04, 2011, 09:45:50 PM

Quote from: madcaddies on November 04, 2011, 02:03:01 PM

dunno much about led technology but one product i have claims 50k hours of operating time before burning out.

On what power source ? ?
It was a 2 part query...