My power source is 12v 40amp(car battery). My project needs 12v but only 500 or 1000ma max. My 12v voltage regulator (NTE960) explodes with 40amps, so I must reduce the current (too much current for other components anyway).
What's the best way to reduce the current before it enters the voltage regulator?
Is the best way to put a
10 watt resistor between the voltage regulator and the power source? (ex NTE-10W015)
Where V=12v and R=15Ohms shows that the output will be 800ma and 9.6watts.
I assume a
10 watt resistor supports 10 watts of output (not that its 10 watts input)
What about a diode? Except for zener diodes I can't find a
10 watt diode.
What if I get 14v instead of 12v? Output will then be 13 watts. What will happen to the resistor then? Should I use a 15 or 25 watt resistor then?