(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 !
As long as the psu is able to supply that amount of current then the voltage should still measure 5V. If not the psu is duff.
Obviously chose the load to match the current rating of the psu you're testing.
Nev
On 25/01/13 20:49, Mark Rogers wrote:
On 25 January 2013 19:16, Anthony Anson tony.anson@girolle.co.uk wrote:
If they don't deliver enough power the potential difference between the + and - lines will be below the stated voltage figure. This will not harm your device, but may destroy your charger - given time.
Thanks. I'll cut an old Micro-USB cable up and take some voltage readings while charging a phone and see how they compare.