Experiment 5 - The Ideal Battery
Up to this point you were not cerncerned about the batteries.
To you they delivered at all times a constant voltage of 9 or 1.5 volts.
You assumed to be using ideal batteries.
An ideal battery with 9 volt is characterized
by the following properties...
It provides a perfect, constant voltage of 9 volts.
It has no electrical resistance
With an ideal battery only the connected load determines
how much current is flowing.
An ideal battery with a load RL.
An ideal 9V battery provides the perfect voltage to the point at which the battery is exhausted.
Consider again the last experiment.
With an ideal battery, with a capacity of 500 mAh,
you would measure the following levels...
At the load the entire voltage of 9 V is applied.
A current of 0.9 A flows.
After 33 minutes the voltage suddenly goes to 0 V
and current ceases to flow.
The battery is dead.
You realize that it does not correspond with reality.
In the next experiments you get to know real batteries.