05-08-2021, 09:21 AM
For a heavy current device resistors are not ideal. To lose 6v at 3 amps is 18 watts; equivant one original headlamp!
I trust everyone at least owns one of the very cheapest analogue meters suitable for old car use (esp if not adjusting any voltage regulators) To lose 6v at 3 amps is just 2 ohms, but the loss peaks with current so tends to drop volts at the part of the sweep where most needed, accentuating the speed variation. 18w or even 10 gets hot..
I trust everyone at least owns one of the very cheapest analogue meters suitable for old car use (esp if not adjusting any voltage regulators) To lose 6v at 3 amps is just 2 ohms, but the loss peaks with current so tends to drop volts at the part of the sweep where most needed, accentuating the speed variation. 18w or even 10 gets hot..