If a true-DC wind generator is installed without a _____, it may be inadvertently powered by the batteries.

A true-DC wind generator is designed to convert wind energy into electrical energy that can be used to charge batteries. However, if it is installed without a blocking diode, it can create a situation where the batteries inadvertently supply power to the generator rather than the generator supplying power to the batteries.

The blocking diode functions as a one-way gate for electricity; it allows current to flow from the wind generator to the batteries but prevents current from flowing back into the generator when there is insufficient wind or when the wind generator is not producing power. Without this diode, the potential for reverse current can lead to a situation where the turbine is effectively powered by the batteries, which could cause damage to the generator or reduce its efficiency.

In contrast, the other options—such as a voltage stabilizer, fuse protector, or transfer switch—serve different functions in an electrical system. A voltage stabilizer helps maintain a steady voltage level, a fuse protector safeguards against overcurrent situations, and a transfer switch allows for safe switching between different power sources. While they are important components in electrical systems, they do not address the specific issue of reverse current flow that a blocking diode prevents.