Final answer:
In a twin engine 12V generator system, connecting both generators in parallel ensures they share loads by maintaining the total emf at 12V while supplying greater current, with a lower total internal resistance allowing more current to flow through the load.
Step-by-step explanation:
In a twin engine 12V generator system, it is necessary to parallel both generators such that they share their loads effectively and efficiently. By connecting the generators in parallel, we ensure that the total electromotive force (emf) remains at 12V, but the system is capable of delivering a larger current. This is similar to some diesel trucks that use two 12-V batteries in parallel; they produce a total emf of 12 V but can supply the greater current required to start a diesel engine. The parallel arrangement significantly reduces the total internal resistance (rtot), which then allows more current to flow through the load.
When components operate in parallel, like in the mentioned twin engine system, they must be in phase with each other, ensuring uniformity of power distribution and preventing imbalances which could potentially lead to inefficiencies or damage to the system. Ultimately, the parallel combination delivers more energy in a given time period, enhancing performance and reliability of the generator system.