Sentence Examples with the word rheostat

Now if the values of the rheostat and condenser are adjusted so as to make the rise and fall of the outgoing current through both windings of the relay exactly equal, then no effect is produced on the armature of the relay, as the two currents neutralize each other's magnetizing effect.

Suppose the key to be depressed, then a current flows through one winding of the differential relay to line and through the other winding and rheostat to earth.