Amps formula??

[dthomas]

I would like to figure how many lights I can safely run at one time. What is the formula for figuring amps based on wattage? /w3tcompact/icons/crazy.gif

 

[BWa]

P=IxE
P= Watts
I= Amps
E= Volts
That moved the dust from my High School days .....

 

[Mike_Dumond]

Voltage times the current. 12w (watts) is equal to 12 volts drawing 1 amp. A 60w light would draw 5 amps.

Keep the greasy side down.
Mike

 

[kcbarnes]

This is probably more than you want but try http://www.elec-toolbox.com/frames.html and check the formulas page or the online calculators.

Kevin

 

[rf33]

I'll add an example (I always needed examples to let me see the light (bad pun intended))
if you wanted to add 5 100W bulbs to a 12V system, this would require

500W = 12Volts X XAmps

X amps = 500W / 12 Volts

X = 41.66 Amps

(lets hope that you do not need 5 100 W lights/w3tcompact/icons/smile.gif)

rf33

/w3tcompact/icons/wink.gif

 

[kcbarnes]

as long as I mentioned online calculators try this site for over 14000 different calculators http://www-sci.lib.uci.edu/HSG/RefCalculators.html

Kevin

 

[dthomas]

Thanks to everyone for the help. I have already added two 50 watt lights and was wondering about running them and the orignal headlights all at once. Since the alternator is rated at 35 amps, I should be alright. Kevin, thanks for the links. Now I will make a spreadsheet application so I will not forget. /w3tcompact/icons/smile.gif