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by engineer is Terminator on June 22nd, 2009
1000mA is 1A.Your back up is 7AH.I.e if you draw 7 amperes it will take you one hour.
so drawing 0.005 A it will take you
7/0.005=14 hours but,it also depends on other factors like temperature ,moisture ,loose connections and the chemical composition and age of your battery.
This LED light's input is 20 ampere(amp, mA) and 3.3 volt and this AAA battery has a output of 1155mA/h and 1.2 volt....(description)
by ethan35t on April 26th, 2010
| 1 person likes this
Can I replace two cr2032 batteries in Kitchen Scales with an AC/DC adapter? If so, what voltage/amps etc?
by WilliamJoyce on April 24th, 2010
| 1 person likes this
Who can tell me a nice Chinese wholesaler website?
by davidzhang on May 16th, 2010
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Would a 3 volt light have the same luminous intensity on 2 AAA as 2 D batteries but not as long?
by SpaceRay on August 5th, 2010
| 1 person likes this
AAA AA C an D batteries are 1.5 volts. So is the difference Ah? If so would a 3 volt light be just as bright on 2 AA as 2 D but not as long?
by SpaceRay on August 5th, 2010
| 1 person likes this
You're reading In supporting an access control system that draws 500mAmps, how long will a 7amp/hour battery backup last in the event of the mains current being dropped from the power supply unit? Show how you calculated your answer.
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Comments
Not even a thanks...huh!!
by CT on July 4th, 2009