B) The coffee maker produces heat which is a useful form of energy. The machine also produces sound which is an unwanted form of energy. This coffee maker has a voltage of 230V.
C) The power rating (W) is 230 times larger than the current used (A).
It would take her 12 minutes because if you mutipy 2/3 by 3/2 then you get 1 (as in one mile) and then you have to do that to the other side too so then you multiply 8 by 2/3 and get 12
