My bench DC supply is set at 12.0v with no limit (equals 5 amps) on the current setting. I place a 21w incandescent auto lamp on the supply and it reads 1.82 amps at 12.0v.
I then measure the voltage drop directly across the lamp and see 11.70v. There is nothing 'downstream' in series with the lamp except for the negative lead of the power supply
Can I presume that there is a resistance in this negative lead which is causing the 0.3v discrepancy - or can there be another explanation?
I then measure the voltage drop directly across the lamp and see 11.70v. There is nothing 'downstream' in series with the lamp except for the negative lead of the power supply
Can I presume that there is a resistance in this negative lead which is causing the 0.3v discrepancy - or can there be another explanation?