Let's say that the load is connected to a 12V battery consumes 3A current. When the 12V battery is replaced with 24V battery causes 6A current flow for the same load.
I'm just trying to understand if the load consumes only the required amps from the source battery regardless of the voltage of the battery or does the change in voltage has direct impact on current flowing through the load
Best Answer
It depends what the load is.
If the load is a resistor with good stability, and adequate power handling for the higher supply, then yes, at twice the voltage it will draw twice the current.
For other loads, the situation is more complicated.
If a resistor has a positive temperature coefficient, like a filament lamp, then it will take less than twice the current at twice the voltage, as it heats up and increases resistance.
If its power handling is only good for the lower supply, it may take twice the current briefly, then burn out and drop to zero.
More complicated loads, like a universal input voltage power brick, may take constant power when charging the laptop battery, so take twice the current at 120v that it takes at 240v.