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defroster as is stated turns on the compressor in most cars.
No the alt produces only as much power as is loaded.
This is how power plants function. IF there is not enough load the turbines start to freewheel (the start turning faster) and then they reduce the amount of heat they are applying to avoid wasting coal.
If you are not running anything of your alternator(your engine is being run from batteries) the alternator is not providing any substantial resistance. Go find an electric motor of any size. turn the drive shaft without the two lead wires being connected to anything. Now turn the wires connected to something that uses electricity(thats not plugged to anything else) and turn it. Its alot harder. If the electricity flow is not being drained out of the lines the EMF resistance doesn't happen.
Think about an anenometer(wind vain). If the vain is moving slower than the wind it obviously drains the wind(if it is pumping water or something), but if you disconnect it from the pump it will spin the same speed(theoretically) as the wind and not cause any(much) resistance. Alt works the same way just consider electricity a fluid and the electrical wiring are pipes and the alt is a pump, if its already moving as fast as the pump can get it the pump doesn't require as much juice.
that said everything drains juice. Stereo systems drain however many amps they are times voltage times .013 to switch from watts to hp. That inverter roughly draws twice as much power as its rated because in converting electricity you lose alot so a 100w probably draws 125-150 and 200 250-275. fans probably run about 30 watts on loaw settings and 100w on high. Any interior LEDs use tiny amounts of power, if you mean like headlight strength LEDs they are rated in watts so it tells you quickly how much power they draw(your headlights just measure the amps times 12 volts to get watts then multiply by .013 to get hp drain.)
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