If the current flows in only one direction it is called direct current, or d.c. Batteries and solar cells supply d.c. electricity. A typical cell or battery may supply 1.5 V. The diagram shows an ...

Description An explanation of the difference between direct and alternating current. The clip includes a short historical outline of the work of Thomas Edison and Nikola Tesla.

Despite the dominance of alternating current in our day to day lives, direct current still has some very useful applications.

Numerous examples are given to illustrate the principles of direct current and alternating current machinery and in addition there is a selection of problems, at the end of most chapters, which ...

(1) TT is usual for writers of books on electrical J- engineering- to confine themselves to the theory either of direct-current or of alternating-current practice. In an elementary treatise, how ...

Recently, Lown and his co-workers 5 showed that in dogs a direct-current discharge from a storage capacitor was safer and more effective than alternating-current countershock.