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# ITT: job exam/application (possibly related to ohms law)

Registered User
Alright, I'm applying for a job as a UPS tech (involves battery backup systems for commercial properties). I must pass an exam before I can move on to the next stage of the hiring process. The lady from H.R. gave me a study guide for said exam, which she said covered all aspects of the test.

My problem isn't that I don't understand any of it, it's that I don't understand one single part of it. Google hasn't really provided me with the help I was looking for (your google-fu may be stronger than mine). So my question is this:

I'm asked to "Be able to calculate total resistance, voltage, total power, current,float voltage"

I have 2000 hours electrical experience under my belt and went to an electricians school. I have a pretty good grasp of Ohms Law, but until today had never heard of float voltage. I understand from reading on line that the float voltage should be high enough to maintain the full charge of the battery, but not so high that it will cause excessive gassing.

How the hell do I calculate the float voltage for a given cell/battery?

Poyndexter on
â€¹^â€º â€¹( â€¢Â¿â€¢ )â€º â€¹^â€º

## Posts

• Registered User
off the top of my head, if the study guide does not provide definitive answers for this, then you can ignore it.

I have NO experience in electrical matters such as this, but from what i can gleen, 'float voltage' is the required voltage to maintain the battery's charge while not overcharging it. Its the thing that most good chargers do. I really only see that term in Lead-acid batteries (cars / UPS equipment (!) )

While I have yet to find a single calculation for it, it does relate to time.