How to calculate potential in an electric circuit with multiple batteries?

[Apteronotus]

How does one calculate the potential in an electric circuit when there are more than 1 batteries present?

For example, in the circuit attached, how would we calculate the potential at A and B?
Is it a simple addition?

Thanks,

 

[berkeman]

How does one calculate the potential in an electric circuit when there are more than 1 batteries present?

For example, in the circuit attached, how would we calculate the potential at A and B?
Is it a simple addition?

Thanks,

Because the left battery is directly connected to A and B, that defines the voltage between A and B.

To the extent that the batteries are not ideal, you would show the internal resistances explicitly, and then solve the equations for the circuit. You can either use KVL or KCL equations. Are you familiar with them?

 

[Apteronotus]

Berkeman,
Thank you for your explanation. I now understand the circuit. I guess the trick is to look at the outer circuit (not including the passive components) and apply KVL to it.

Thank you again,

Apteronotus