Originally Posted by bigtwin
Your answer may be correct but it is not, I believe, because of Ohm's Law. Ohms law merely defines the relationship between voltage, current and resistance.
An interesting pair of sentences illustrating how we use language loosely at times.
NOTHING happens "becuase" of a law. The law describes the relationship (and it often has provisos which we ignore for brevity).
The laws which most appropriately describe currents and voltages in these situations are probably Kirchoff's Laws. (Just spotted Frank's post of 10.02pm)
Analogies to electric current may also not be helpful: in a series circuit the instantaneous current is the same at every point (ignoring relativistic effects, etc). The current leaving the positive pole of the alternator is the same as the current entering the negative pole, so there is no meaningful concept of "pulling" or "pushing".
In basic terms, the power supplies convert their input power (motion, electricity) into output power (electricity) and a current flows which depends upon the net voltage and the resistance. As the battery charges, the net voltage falls and so does the current. (Devices which can output a "constant" current give a different perspective). This current causes a reversible chemical change in the materials inside the battery: when the battery provides the power, the chemical change occurs in the "opposite" direction. (As the chemical change occurs, the total resistance of the circuit changes, so the process is even harder to describe succinctly.)
If you find it confusing, just think of it as "magic" and be grateful that it happens. When it stops, buy a new battery or, less frequently, a new charger.
Enjoy a useful energy source - Gordon