Measuring power consumption of dual supply circuit

[jram112]

I want to measure the power consumption of my opamp circuit. I understand for a single supply circuit that I can take the supply voltage, measure the current, and then compute the power. However, for a dual supply circuit there are two supply voltages. Should I measure the power from both the positive and negative supply then add them together? Should I measure them simultaneously, etc?

Also, I have the EEVblog uCurrent. Should I be concerned with the virtual ground being connected to the current input terminals?

Thanks

[Zero999]

To compute the power, you need to measure two currents and two voltages. It doesn't matter whether you measure the +V to -V and +V to 0V or -V to 0V, just as long as you have two voltage and two current measurements. Look at the Ohm's law formula and you'll see what I mean.