We have seen how a conducting wire moving with respect to an electric field ( B ) will experience forces upon its electrons. Consider the diagram below:
Due to the proper ( perpendicular ) alignment of the loop and magnetic field, the maximum amount of DC current will be produced; however the voltages and currents that are induced will pulse from high and low with a predictable frequency:
As diagrammed above, the DC generator’s rotor has made ¼ of a complete turn as the rotor cuts through the maximum ( Max ) quantity of magnetic lines of flux ( ɸ ) as it rises to position ( B ), where the loop’s area is parallel with the permanent field. Position ( C ) has been reached when, once again, the conducting loop is upright with its area being perpendicular to the B-field. At this point, the split-ring commutator prevents a reversal of current ( I ) from occurring. The loop once again begins to cut into the magnetic flux, and it does so at a maximum when ¾ of a complete rotation has been made. When a complete rotation has been made, the loop is back at position ( A ), and the commutator ring once again prevents a reversal in current directions. We will now look at a diagram in which the current recipient is replaced with a voltage ( V ) source. This converts this system from a DC generator to a DC electric motor:
Fortunately, all that is needed to put the system into rotation is a modest push to the rotor.
WE HAVE NOW REACHED THE END OF THE COURSE!!! Congratulations, and best of luck in all of life’s endeavors 🙂.
P.S. Turn the lights off before you leave.
RENAISSANCE PHYSICS 