Solved: In an automobile, the system voltage varies from

Chapter 16, Problem 78GP

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QUESTION:

Problem 78GP

In an automobile, the system voltage varies from about 12 V when the car is off to about 13.8 V when the car is on and the charging system is in operation, a difference of 15%. By what percentage does the power delivered to the headlights vary as the voltage changes from 12 V to 13.8 V? Assume the headlight resistance remains constant.

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QUESTION:

Problem 78GP

In an automobile, the system voltage varies from about 12 V when the car is off to about 13.8 V when the car is on and the charging system is in operation, a difference of 15%. By what percentage does the power delivered to the headlights vary as the voltage changes from 12 V to 13.8 V? Assume the headlight resistance remains constant.

ANSWER:

Step-by-step solution

Step 1 of 2

The system voltage when the car is off:, the system voltage when the car is on:

The power output when the car is off and on:

R is the resistance of the head lights.

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