Chapter 17 - Electric Current and Resistance - Learning Path Questions and Exercises - Exercises - Page 619: 3

a). Voltage across the whole arrangement = $6+6+12=24V$ b). The total voltage would be $12V$, when the $12V$ battery is in parallel with the two $6V$ batteries in series.

a). Voltage across the whole arrangement = $6+6+12=24V$ b). The total voltage would be $12V$, when the $12V$ battery is in parallel with the two $6V$ batteries in series.