On the back of PC monitors it shows a voltage and current rating. Are these rms values? If I want to know the power consumption, can I simply multiply the voltage byt the current?
Similarly, for energy star ratings, if they specify a max power, is that simply P = Vrms * Irms?
That is the correct formula for a resistive load. It is an upper bound on more complicated loads.
For instance, loads that have an inductive or capacitive component use some of that current to store energy in magnetic or electric fields, each half cycle, but return it to the power line, before storing it the other way, the next half cycle. So the rms current may include components that do not represent consumed power, but just borrowed power.
I would like to know the typical max current draw from a PC monitor. If I new the energy starrating was 3W and I could use P = Vrms * Irms, then I would know the typical max. Of course, this assumes that most monitors are energy star compliant.
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