Experiment 15 - Practical Comments (Single Battery)
With the knowledge of the internal resistance of a real battery
and its dependence on the state of charge,
there are some valuable comment when you work with batteries.
In the case of a single battery, this means...
Avoid short circuits
With batteries you have to avoid a short circuit under all circumstances
and at all times.
In the case of a short circuit a high current occurs.
If the current finds no other load to consume its energy,
the total energy is consumed by the internal resistance.
As a result, the battery heats up strongly
and can be severely damaged.
Determine state of charge
The state of charge of a battery can not be determined by simply
measuring the voltage at the battery.
Upon discharge of the battery the voltage
dropped only from 9.0 V to 8.4 V.
Can determine the state of charge state of a battery
only in a load circuit.