Final answer:
It is typically not advisable to wire multiple Class 2 or Class 3 power supplies in parallel. Power dissipation increases when resistors are wired in parallel, and multiple filaments wired in parallel are used to achieve different power settings in light bulbs.
Step-by-step explanation:
The answer is typically No, as power supplies are not designed to be wired in parallel unless specified by the manufacturer. Power supplies have precise voltage regulation mechanisms that could conflict when connected in parallel, leading to potential damage or operational issues.
When arranging power output configurations such as requiring a current output of 6 A at 3 V (18 W), it's essential to consider the specifications of your power supplies. As for the total power dissipation in a system, when a second resistor is attached in parallel with the first, the power dissipated increases because for parallel combinations, individual devices can draw power independently.
In the scenario where multiple filaments are switched and wired in parallel to achieve multiple power settings in light bulbs, the minimum number of filaments needed for three power settings is three, allowing for three different levels of illumination.