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Am building a spotlight cct for a dog racing helmet, do I need a resistor?
The Power supply is currently 12 V 7.0Ah and the Spotlight is rated 12v 55W, am also placing in a switch. Been a few years since I did this, do I need a resistor/fuse and how do you know. Also would it be better if I used a different power supply eg 4.0Ah 12V power supply etc....
12 v and 55 w comes to a current of 4.6 amps.
Power supplies are rated in volts and amps, not amp-hours.
Batteries are rated in amp-hours as they have a limited capacity before they discharge.
So I assume you are talking about batteries, not power supplies.
A 12 volt 7 amp-hour battery will power a 4.6 amp lamp for 7/4.6 or 1.5 hours. Although i would not count on more than an hour.
a 4 amp-hour battery will last for well less than an hour.
You need a switch to turn it off and on. You don't need a resistor unless the light is too bright. But in that case you would be better off switching to a lower wattage bulb.
A fuse will protect you against shorts, and doesn't use any power. Use a 8 or 10 amp fuse.
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