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Pretty much everything. It provides the spark for the spark plugs, the power for all electrical and electronic components, etc. The alternator doesn't take over for the battery once the car is started - it simply keeps the battery charged.

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Q: What is the battery power in a car used to activate?
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Related questions

Can you activate the over discharging car battery?

Do you mean activate the battery when it won't work? you can take it to the place you bought it


What is a car battery used for?

To power a car ================================================================ you're ALMOST correct. Car Batteries are used to start and maintain the power of a car.


Is the car battery used after starting?

The battery is used to start the car, and then the alternator takes over to keep the supply of power and to recharge the battery.


Does a casette adapter used for my ipod use power from my car battery?

Yes, the cassette is inserted into your car stereo which uses power from the battery.


What is an average car battery?

A car battery is a device used to create power for your car. Without it the car wouldn't start.Inside the battery there is some type of acid (usual alkaline or lithium).


Why is lead used in battery's?

Lead is used in car batteries because it stores a charge which can be used to power car electrical systems and accesories


Where do you use direct currect?

An example of direct current is the current used from a car battery to activate the starter motor. Also the flashlight uses direct current.


Can a car start with a bad alternator?

Yes it can as long as the battery is charged . The purpose of the alternator is to put the power used back into the battery.


Can you start your car with a bad alternator?

Yes it can as long as the battery is charged . The purpose of the alternator is to put the power used back into the battery


Should your car stay running when you take the pos battery termanal off?

A battery is used to start a car. Once it is running, the alternator then supplies electrical energy to charge the battery as well as power the electrical systems in the car. Removing the battery while the car is running will not affect the running of the car.


Why would your car battery keep running down and the car is not being used?

A dead cell in the battery will cause this. Also, any light that is on pulling power from the battery. Another possibility is a stuck relay.


Is it bad to use a boat battery in a car?

When you say boat battery if you are referring to a Deep Cycle battery as used to power a trolling motor then no, it is not suitable for use in a car. However, if you are referring to a battery in a boat used to start the engine and it is not a Deep Cycle battery it will work just fine in a car as long as it fits the battery holder, can be strapped down, and the battery posts are orientated correctly.