Use illustrations and graphics to help your reader understand the text.
Make sure they are clear and the captions are easy to read.
Place them on the page in a way that does not interrupt normal reading patterns. Your reader should not have to “jump” over an illustration to read the text.
Use:
With proper grounding, about 90% of lightning damage can be prevented. During severe electric storms, however, you should turn the power switch off and disconnect the power cord and the telephone line cord.