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what is the power loss over the first light bulb?

I am not entirely sure which equations to use how ever the ones which i thought to use are:

V=RI

P=VI

P=V^2 / R

I am really stuck and dont know how to find the acual power loss. I think my main issue is gather the correct information and implimenting it in the right situation.

I have attempted to find the total, R1+R2+R3= 32Ω

And then i have divided each by the source 12... 2.66A

Can someone please direct me in the right way...? I am gettin quiet frustrated with it!!