Batteries are connected when the terminal voltage across each of them was measured because batteries have an internal resistance that is in series with the load.
<h3>What is a chemical reaction?</h3>
A chemical reaction is a process in which one or more substances, also known as reactants are converted to one or more different substances, known as products. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products
In batteries, the chemical energy is converted into electrical energy with help of a chemical reaction happening inside the battery.
Batteries and other power sources have an internal resistance that runs parallel to the load. The overall resistance of the path of the electron flow inside the source constitutes the internal resistance, which is not technically a resistor. Usually, internal resistance is extremely minimal.
Thus, considering the internal resistance of the batteries, the terminal voltage across each of them was measured.
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