Originally Posted by
Bunyan
Hi Guys,
Great read! I have a question regarding batteries. I couldn't find the equasion to figure out how much amps a certain light will draw.
I'm trying to figure out if I can use a 14.8V 2300 mAh (4S1P A123 - from a Dewalt power pack) rated to 15C with a 12V 20W Halogen light MR16.
If that doesn't work, I might try my hand at one of the DIY LED lights.
Appreciate it!
Some simple
electrical laws Are needed here
Watt's law
Watt =Current * Voltage
so Amps ( current ) = Watts/Voltage
I = 20/12 = 1.7 amps
yes you can use that batterey you will get about 1 hour 15 minutes of run time