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