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physics noob

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coil connected to a 240 V (rms) ac line has a resistance of 34 ohms. what is the average power used

(.5)V^2 /R so Pav = 847 W

then it asks what are the min and max values of the instanteous power???

this is where im stuck, i think i need to use the equation

P(t)= IVsin^2 (omega(T)) but how do i know what t is, and the angular freq??? any help would be greatly appriciated,,,,also any knowledge on the topic would help, cause these ac circuits are kind of hard for me.... thanks