Final answer:
The nominal voltage of 6 AAA batteries connected in parallel is 1.5V because the voltage does not change with parallel connection, it remains the same as a single battery's voltage.
Step-by-step explanation:
When batteries are connected in parallel, the nominal voltage remains the same as the voltage of a single battery, regardless of how many batteries are connected. Therefore, if we have 6 AAA batteries with a nominal voltage of 1.5V each and connect them in parallel, the total voltage of the setup will still be 1.5V. On the other hand, if the batteries were connected in series, the voltages would add up; for N batteries in series, the terminal voltage is N times the voltage of one battery.
In practical scenarios such as in small electronic devices, a common 9-V battery is often made of six 1.54-V carbon-zinc dry cells connected in series. However, connecting batteries in parallel is generally done to increase the current capacity (amp-hours) rather than the voltage.
With this understanding, the correct answer to the question 'What is the nominal voltage of 6 AAA batteries connected in parallel?' is option 4) 1.5V.