Kirchhoff's Loop Rule Video Lessons

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Problem: Your car will not start. You open the hood and measure the voltage on the battery as 14 volts. You then have a friend try to start the car while you continue to monitor the voltage on the battery. When your friend turns the ignition key, the battery voltage drops to 7.5 volts. If the car is drawing 150 A from the battery, what is the battery's internal resistance? a. 0.01 Ω b. 0.14 Ω c. 0.04 Ω d. 0.09 Ω e. 0.05 Ω

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Problem Details

Your car will not start. You open the hood and measure the voltage on the battery as 14 volts. You then have a friend try to start the car while you continue to monitor the voltage on the battery. When your friend turns the ignition key, the battery voltage drops to 7.5 volts. If the car is drawing 150 A from the battery, what is the battery's internal resistance?

a. 0.01 Ω

b. 0.14 Ω

c. 0.04 Ω

d. 0.09 Ω

e. 0.05 Ω

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Kirchhoff's Loop Rule concept. You can view video lessons to learn Kirchhoff's Loop Rule. Or if you need more Kirchhoff's Loop Rule practice, you can also practice Kirchhoff's Loop Rule practice problems.

How long does this problem take to solve?

Our expert Physics tutor, Juan took 1 minute undefined to solve this problem. You can follow their steps in the video explanation above.