It will show the correct amps flowing through it
The voltage at which those amps are delivered will affect the total power
Which will now be twice as much per amp delivered
But the amp meter is not a power meter
1 amp is 1 amp
No matter the voltage, 1 volt or 6 or even 12 volts
The power will be different however
Because the voltage drop that the amp “falls” through does work
Like dropping a bowling ball on your foot from you hand or off the roof
Same bowling ball, but falling from the roof top sure as heck would do more work on your foot
-s