2. Currents may be generated in a wire by setting up these whirls.
3. We can set up these whirls by increasing or decreasing the relative distance between magnets and wires.
4. To set up and maintain these whirls consumes power.
5. To induce currents in a conductor there must be motion between them so as to alter the number of lines of force (Fig. 4 to 7).
6. Increase in the number of lines of force in the circuit produces a current of the opposite sense to decrease (Fig. 7).
7. Approach induces electromotive force in the opposite direction to that induced by retreat.
8. The stronger the magnetic field the stronger the current.
9. The more rapid the motion the stronger the current.
10. The greater the length of the conductor which cuts lines of force the stronger the current.
11. The shorter the conductor not so employed the stronger the current.