#### ringo888

##### Member level 1

**how to calculate current consumption**

Hi Guys,

I've come abit stuck on this one:

If I had 2 seperate regulators (+5V and +3.3V) and i was getting current consumption of:

250mA @ 5V

and 400mA @3.3V

How would you calculate the current at Vin if Vin was say 12V. This is just a generic question, I don't have a real-world circuit to provide any further information, its just a general question.

As usual, any help would be really appreciated.

Thanks,

Ringo888