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Electric Potential Car Battery Problem

  • Thread starter maphco
  • Start date
24
0
1. Homework Statement
A particular 12V car battery can send a total charge of 84 A-h (ampere-hours) through a circuit, from one terminal to the other. (a) How many coulombs of charge does this represent? (b) If this entire charge undergoes a change in electric potential of 12V, how much energy is involved?


2. Homework Equations



3. The Attempt at a Solution
I'd just like some advice in starting the question, simply because I'm not accustomed to working in Ampere-hours. Just a hint would do nicely.
 

Answers and Replies

351
2
Ampere-hours = 1A*1h
so, they multiplied their current by the time
and now just use simple formulas ..
i = change in q/change in time ..
 
24
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I'm still not sure how thew book gets an answer of 3.0 x 10^5 C
 
24
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Anyone got any other hints?
 
Dick
Science Advisor
Homework Helper
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I think an amp is 1 coulomb per second. What do you think it is? That's a hint, son.
 
24
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So for an hour the charge would be 84 * 60?
 
Dick
Science Advisor
Homework Helper
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618
It would be if an hour were equal to 60 seconds. But it isn't.
 
Last edited:
24
0
Ohhhhhhhhhhhh, alright, I get it. It's a simple dimensional analysis problem. Yeesh, why didn't I realize that...
 

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