What is the name of the coil that receives energy from the AC source?

• A. Primary Coil
• B. Secondary Coil
• C. Input Coil
• D. Output Coil

Answer: (A)

The primary coil is the correct answer because it is the component in a transformer or inductive system that directly receives energy from the alternating current (AC) source. When voltage is applied to the primary coil, it generates a magnetic field that induces a voltage in the secondary coil, which is used to power the load. The design and function of the primary coil are crucial, as it acts as the initial point where electrical energy begins its transformation and transmission within the system. This foundational role is essential in both power generation and transmission, making the primary coil vital for efficient energy transfer.

The secondary coil is involved in the process as well, but it does not receive energy from the AC source; rather, it takes the energy that has been transformed by the primary coil. The terms "input coil" and "output coil" are less commonly used in standard terminology regarding transformers, which makes them less specific than the clearly defined roles of primary and secondary coils.