dthomas
Member
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
Amps formula??
- Thread starter dthomas
- Start date
- Views: 1233
BWa
Silver Member
P=IxE
P= Watts
I= Amps
E= Volts
That moved the dust from my High School days .....
P= Watts
I= Amps
E= Volts
That moved the dust from my High School days .....
Mike_Dumond
Gold Member
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
Keep the greasy side down.
Mike
kcbarnes
Gold Member
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
Kevin
rf33
Gold Member
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
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
kcbarnes
Gold Member
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
Kevin
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
