Creating alternating current (A.C.)
We can create an alternating current from the mechanical movement of turning around a handle.
Producing an alternating current means the voltage produced alternately reverses from positive to negative polarity producing a corresponding change in direction of current flow.
We can use Flemings right hand rule.
Right = Induced
Flemings right hand rule shows us the direction of the current in the wire below.
When the handle has been spun 180° you can see the direction of the current in the wires has reversed.
The galvanometer will show a complete movement from one side to the other and back again.
If you were to plot the voltage change through time for one complete 360° revolution of the handle you would find the following:
NOTE: Point `A` is where the wires within the magnetic field are vertically aligned. Point `B` is at the 1st diagram. Point `C` is at the second diagram.