Question

Students are given some resistors with various resistances a battery with internal resistance

Answer 1

Explanation

Step-by-step explanation:

V = emf − Ir ,

where r is the internal resistance and I is the current flowing at the time of the measurement.

I is positive if current flows away from the positive terminal. The larger the current, the smaller the terminal voltage.

Resistances is series add the total resistances

while in parallel reduces .

Answer 2

One of the primary reasons why a battery should have an internal resistance is that because it is connected to an electromotive source. This electromotive force that is caused by a potential difference would be used for driving the current to power the electrical loads the battery sustains.