What is the charging current for a 120 ampere-hour storage battery?

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Homework Help Overview

The discussion revolves around calculating the charging current for a 120 ampere-hour storage battery and the discharge time for a lead-acid battery under different current conditions. The subject area includes battery charging and discharging principles, specifically focusing on ampere-hours and current measurements.

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  • Mixed

Approaches and Questions Raised

  • Participants explore the relationship between ampere-hours and charging current, with some suggesting the use of RC equations for battery behavior. Others highlight the need to convert ampere-hours to amperes through division by time.

Discussion Status

There is an ongoing exchange of ideas, with hints and suggestions provided to guide the original poster. Some participants are questioning the assumptions made in the problem setup, while others are engaging in light-hearted banter regarding the complexity of the calculations.

Contextual Notes

Participants are navigating the implications of the battery ratings and the relationships between current, time, and capacity. The original poster expresses confusion about the initial steps, indicating a need for clarification on the fundamental concepts involved.

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Charging current

I am total stumped on the following to questions so if someone could show me how to get started that would be good thanks.

1) A storage battery rated at 120 ampere-hours is to be fully charged at constant current in 8 hours. Calculate the charging current.

2) A lead-acid battery is designed to give continuous discharge of 180 amperes for 5 hours. Calculate the time it will be discharged by a steady current of 220 amperes.
 
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Why don't you use the RC equations for charging and discharging? I would assume you can treat a rechargable battery like a capacity in series with a resistor.
 
Hint: ampere-hours is a product.
 
DDuardo, were you teasing?

1) A storage battery rated at 120 ampere-hours is to be fully charged at constant current in 8 hours. Calculate the charging current.
A current is measured in amperes. To go from ampere-hours to amperes, you divide by hours! Think about it.

2) A lead-acid battery is designed to give continuous discharge of 180 amperes for 5 hours. Calculate the time it will be discharged by a steady current of 220 amperes.
This is really a "proportion" problem. Let t be the time required by the 220 ampere current. Then x is to 220 as 5 is to 180.
Or, in more modern terms, x/220= 5/180.
 
Thank you, HallsofIvy. Yes, it was a joke. I was trying to make the poor guy complicate the problem even further seeing how you just have to multiple a couple of numbers to get the solution. :smile:
 
Gosh, you're evil!
 

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