The instrument used to turn wind energy into electrical energy is aa.turbineb.Yaw motorc.bladed.generator

The instrument used to turn wind energy into electrical energy is a turbine. Here's a step-by-step explanation:

1. Wind energy is captured by the turbine's blades. The wind causes the blades to rotate around a rotor.

2. The rotor is connected to the main shaft, which spins a generator to create electricity.

3. The generator, which is the key component for converting wind energy into electrical energy, uses the principle of electromagnetic induction to produce electricity. This is achieved when the rotating shaft of the turbine causes the magnets within the generator to also rotate, creating a flow of electrons which is electricity.

4. The yaw motor is used to turn the turbine to face the wind for maximum efficiency, but it does not directly convert wind energy into electrical energy.

So, the correct answer is a. turbine and d. generator. Both are needed to convert wind energy into electrical energy.