Re: How do I convert watts, amps and volts to size circuit capacity

Good question, but I've got one in return.  Are you absolutely sure that 
the bulbs you state are really 2.5 amp and not 2.5 WATT?  This makes a 
huge difference.  I'll give you answers for both.

First scenario:  assuming that the 2.5 amp bulbs really draw 2.5 amp, then 
you can put absolutely no more than six on a 15 amp circuit (6 x 2.5 = 15 
amps) but I would not put more than five on for safety's sake.  I would 
not add *any* of the seven watt bulbs on in addition, again for safety's 
sake.

Second scenario:  Take your 2.5 amp bulbs as really being 2.5 WATTS, which 
is very likely the case.  Then they will draw, by Ohm's law, 2.5/120 = 
0.021 amp.  The seven watt bulbs will draw 7/120 = 0.059 amp.  Now the 
problem is very simple.  You can use any combination of 2.5 watt and 7 
watt bulbs AS LONG AS the total current drawn is less than about 12.5 
amp.  You can see from this that you'll have to do some addition of 
currents to get the number of lamps you can put on, and many combinations 
of lights are possible.  GOOD LUCK!