I have a power source that puts out 305-315 volts Dc after The AC circuit that feeds it is rectified using a full wave bridge rectifier.

After applying a resistor load to the 305 DC output the voltage across the resistor drops to 250 volts DC.

Figuring out the circuit WATT POWER do I use the 305 DC output voltage or the 250 volt DC drop in my WATT POWER calculations?

Say my current is .0105 amps. Using the 305 volts output DC my Watt value is 3.2025

Using the 250 volt DC drop my Watt value is 2.625

Which is correct to figure Watt power?

Tom