Pasquale Pollet: You have presented a problem without stating what means are intended to solve it. You are asked to check a statement of power. You gave a year but what country(s) are you talking about? Where are you finding "...the graph of 103 exajoules primary use in 2002" What resources are you to use to check this number? If it was past classroom work it seems you missed a bit more than one class. Are you expected to go out on the world wide web for the numbers? Apparently this mysterious "graph" lists "transportation energy" separately. Apparently you are intended to make an assumption that electricity from plug in electric vehicles or hybrids will increase electrical usage. There has been some mention of this among the questions here. There is some reason to challenge the assumption (1) of an increase and some go along with it unquestioned. To respond to this problem you may be required to not challenge the assumption but you still have to have some ! basis on which to express your answer. You have to know the value associated with this 80% increase and "the graph" may be some clue to this but probably not all the required facts.You might find a better answer with all the information under the "Physics" section which can be found under "Science and Mathametics"...Show more
Robt Heemstra: Is this all the information in the question?It doesn't make sense, are they asking you to calculate the energy required as an input to power plants ie. MJ of gas, to supply the required energy for conversion to power 80% of transport assuming it switches to electric/hybrid cars? If so what is the final transportation energy amount currently being talked about?
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