Wikimedia
Wikipedia: Current (Electricity)
Wikipedia offers detailed information on electrical current, including many hyperlinked related terms.
Other
Beginner's Guide to Measurement in Electronic and Electrical Engineering [Pdf]
The National Physical Laboratory, which is the UK's National Measurement Institute, offers a Beginner's Guide to Measurements in Electronics and Electrical Engineering. Discusses how electric currents are measured and offers images.
Other
Southwest Tech: Combination Circuit
Explains what a combination circuit is and how to calculate the resistance and amperage values in this type of circuit.
Other
Corrosion Doctors: Electroplating
A clear explanation of the facets involved in electroplating, the materials and surfaces, the sequence of operations.