12v car battery. How to lower amperage output for a device?

[ann58585]

How do I lower the amperage output best for a device that will suck my car battery dry without loosing too much energy?
There are several methods but I would like to know a way to say get around 1 ampere max out to my device the most energy efficient way. Not loosing too much to heat.
The battery is a normal car battery charged normal so between 13.5 V and 10 V operating.
What method is best?
resistor?
capacitor?
Diode?
anything else?
I have a 1a schottky diode 1n5859. Could I just put that in between or should I put more than that? fuse?

 

[telectrix]

the battery will supply as much current as the load requires.it's the load that determines current draw, not some cock-up devices, unless you want to limit the load current, then will the load function at a reduced current level?

 

[static zap]

Bulbs tend to stabilize the current (just resist staring directly)
..Next problem modern car batteries HATE / are not even designed to go below 12 / 12.1V without the " paste " inside dropping off the plates !
Its called Deep Cycle discharge - electric scooter batteries more appropriate.
--You need an appropriate fuse near battery -
-or inexperience may cause fire !--

 

[ann58585]

ok so 12v battery fuse and then what? device.
The device wants to draw 6a and I do not want it to because it will not work for that purpose.

 

[ann58585]

bulb uses too much.

 

[StephenRowley]

As Tele says it's the battery will just give what ever current download demands. But I would use a fuse as if something does short the car battery can deliver a lot of current.

really need a bit more detail about exactly what your trying to power and the exact charity battery arrangement to give proper advice. For instance if the device if particular sensitive to voltage variation some form of voltage regulator

 

[static zap]

Re reading post sounds like you have a 9 -10V device , you believe only takes 1A .
( This is where experience takes over-need info about actual device -as plenty take a surge at startup )
Most efficient is more expensive ,but may have Auto shut-off ,
that may save you from a car that wont start !

 

[Marvo]

A battery is effectively a constant voltage driver, not constant current.

If you have a load (device) that requires current control you'll need to give us more info about the device.

Fusing of circuits supplied by a battery is essential because it will deliver 'unlimited' (not actually unlimited but enormous none the less) current if there's a fault or overload.

 

[Adam W]

There is more than likely a standard way of doing it without having to resort to ingenuity.

 

[PEG]

If the device "wants" 6A,giving it 1A may cause other issues...

Tell us what the device is or you may start to get "tie a knot in the cable" type of advice...