With the enlarged light bulb, it appears that Vista uses much more electricity than National City. Click on the graph to see a better representation of the data. Adding extras to a graph Extras are added to graphs to emphasize a piece of information. Pie graphs are often used with an exploded piece. Sometimes this piece is not much greater than another piece, but the emphasis causes the viewer to see it as more.
Pie charts are valuable, but research shows that people prefer bar graphs.
The graphs to the right show three ways of expressing information. This graph uses an exploded pie piece when it is not that much larger than some of the other pieces. This is a fair representation of the data using a pie chart. Research has shown that bar graphs are easier for viewers to read and comprehend.