Someone (actually an IRSE Exam examiner) has just let me know about a useful source of electrical / electronic information:
http://forum.allaboutcircuits.com/
Another good site at explaining how things such as relays and motors work:
http://www.pcbheaven.com/
http://forum.allaboutcircuits.com/
Another good site at explaining how things such as relays and motors work:
http://www.pcbheaven.com/
PJW