There are several electronic book collections available from the Drexel University Libraries web site that students in these programs may find them very useful. Start with the following eresources:
ebrary
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Ebrary is a collection of thousands of online full text books and other materials in a variety of subject areas
ENGnetBASE
Collection of over 320 engineering handbooks published by CRC Press.
knovel: Engineering & Scientific Online References
Database of some of the leading engineering reference handbooks, databases, and conference proceedings.
MATERIALSnetBASE
MATERIALSnetBASE includes over 75 fully-searchable ebooks on the topics of Materials Science, Packaging, and all aspects of Engineering.
Referex Engineering
Referex Engineering is a collection of over 300 engineering eBooks in 3 distinct collections including Materials, Mechanical and Electrical engineering.

Try also Wiley encyclopedia of electrical and electronics engineering [electronic resource]