Hello everybody, I purchased buck driver of 1.8a, seller said it was tested. it gives 1.8a constant current. I tried to test it. I have ac to dc adaptor of varying voltage. I set it to 7.5V but when I check with Multimeter it was showing 13Volts. anyways I took the 7.5V for calculation because the adaptor shows that value. I calculated using ohms law. V=IR R=V/I, 7.5/1.8 R= 4.166 say 4ohms I have 1 ohm resister (don't know how much wattage) on checking with multimeter I got the value around 1.5 and then I connected alligator wires and then checked it and it gave me 4ohms resistance. then I connected the AC-DC adaptor to the Driver and I connected multimeter in series with the output of the driver to calculate current. It suppose to show me current around 1.8A but I only get 700mA. I want to know what is the mistake and where will be the fault. Am I doing anything wrong. is that Adaptor wrong? Please clarify.