• Support PF! Buy your school textbooks, materials and every day products Here!

Electric Circuits Problem

  • Thread starter Seda
  • Start date
71
0
1. Homework Statement

If you accidentaly leave your car headlights (current drain 5A) on for one hour, how much of the 12-V battery's chemical enegy is used up?


2. Homework Equations

Well, there's Ohm's Law...and it's million forms

3. The Attempt at a Solution

First things first, I'm not sure whether to think of the power source as an ideal battery or not (ie, should I think about an internal resistance or not.)

Ok, the time factor is throwing me off. I'm not sure how to use the time (one hour) in any form of Ohms law. And I'm not sure if the current drain is the current through the battery of the entire circuit or the headlights or what. Any ideas?
 

Answers and Replies

berkeman
Mentor
56,129
6,157
What is the definition of electrical power in terms of voltage and current? What is the definition of energy, in terms of power and time duration...?
 

Related Threads for: Electric Circuits Problem

  • Last Post
Replies
8
Views
2K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
24
Views
2K
  • Last Post
Replies
6
Views
1K
  • Last Post
Replies
3
Views
1K
Replies
2
Views
4K
Replies
3
Views
8K
Top