26 Jan
2013
26 Jan
'13
10:49 a.m.
On Fri, Jan 25, 2013 at 09:21:05PM +0000, nev young wrote:
(Sorry if this appears twice.)
When I needed to test 5volt supplies I made a simple load resistor out of 21W 12v car bulbs. putting 1 across the 5v supply should draw 0.729A 2 in parallel should draw 1.458A 3 in parallel should draw 2.188A 4 ... 2.92A etc.
As long as I've got my sums right !
Ah, but lamp bulbs *do* change their resistance significantly from cold to hot/alight.
--
Chris Green