Why do headlights on a car dim when the motor is operated

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In summary, headlights on a car dim when the motor is operated due to a drop in voltage in the car's electrical system caused by the motor's power consumption. While using LED headlights may help reduce the dimming effect, it will not completely prevent it. A weak car battery can also contribute to headlight dimming, along with other factors such as a faulty alternator or loose connections in the electrical system. To prevent headlight dimming, regular maintenance and upgrades such as a stronger battery, clean terminals, and a voltage stabilizer can help regulate the power supply to the car's electrical system.
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valli
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Homework Statement


why do headlights on a car dim when the starter motor is operator.
battery emf = 12V
internal resistance - .040 ohm
starter motor current = 100 A.

Homework Equations





The Attempt at a Solution


 
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Welcome to physicsforums, valli. I hope you find it helpful. The way we roll here is that you also give some relevant equations and your first attempt at a solution, and then someone will be along to give some guidance to get the rest of the way to a solution. Good luck!
 

1. Why do headlights on a car dim when the motor is operated?

Headlights on a car dim when the motor is operated because the motor requires a significant amount of power to operate, which causes a drop in voltage in the car's electrical system. This drop in voltage results in the dimming of the headlights.

2. Will using LED headlights prevent them from dimming when the motor is operated?

Using LED headlights may help reduce the dimming effect, but it will not completely prevent it. LED headlights still require power to operate and can also be affected by a drop in voltage in the car's electrical system.

3. Can a weak car battery cause the headlights to dim when the motor is operated?

Yes, a weak car battery can contribute to the dimming of headlights when the motor is operated. The battery is responsible for providing power to the car's electrical system, and if it is weak or failing, it may not be able to supply enough power for all components, including the headlights.

4. Are there any other factors that can cause headlights to dim when the motor is operated?

Aside from a drop in voltage in the car's electrical system, there are a few other factors that can contribute to headlight dimming. These include a faulty alternator, corroded battery terminals, or a loose connection in the electrical system.

5. How can I prevent my car's headlights from dimming when the motor is operated?

To prevent your car's headlights from dimming when the motor is operated, you can take a few steps such as regularly checking and replacing a weak or failing battery, keeping the battery terminals clean and free of corrosion, and ensuring all electrical connections are secure and tight. You may also consider upgrading to high-performance headlights or installing a voltage stabilizer to help regulate the power supply to your car's electrical system.

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