There are several online forums and communities where you can discuss electrical engineering optional subjects with fellow students. These platforms provide a great opportunity to connect with like-minded individuals, share knowledge, ask questions, and engage in discussions related to electrical engineering. Here are a few popular options:

1. EduRev:
EduRev is an online learning platform that offers a dedicated community section where students can interact with each other. It provides a wide range of study materials, including notes, videos, and practice questions, specifically tailored for electrical engineering optional subjects. The community section allows you to post queries, share resources, and engage in discussions with fellow students.

2. Quora:
Quora is a popular question-and-answer platform where you can find a wide range of topics, including electrical engineering. You can follow relevant topics and join discussions related to electrical engineering optional subjects. Quora allows you to ask questions, provide answers, and engage in discussions with other users who have expertise in the field.

3. Reddit:
Reddit is a platform that hosts a variety of communities called "subreddits" dedicated to different topics, including electrical engineering. You can join subreddits such as r/ElectricalEngineering, r/ECE, or r/AskEngineers to connect with fellow students and professionals. These subreddits provide a space for sharing resources, asking questions, and engaging in discussions related to electrical engineering optional subjects.

4. Stack Exchange - Electrical Engineering:
Stack Exchange is a question-and-answer platform that covers a wide range of topics, including electrical engineering. The Electrical Engineering section of Stack Exchange allows you to ask specific questions related to your optional subjects and receive answers from experts in the field. You can also browse through previously asked questions and answers to expand your knowledge.

5. LinkedIn Groups:
LinkedIn offers various groups related to electrical engineering where you can connect with professionals and students. These groups provide a platform for discussions, sharing resources, and networking with like-minded individuals. Some popular LinkedIn groups in the field of electrical engineering include "Electrical Engineering Community" and "Power Systems Engineering."

In conclusion, these online forums and communities provide excellent platforms for students to discuss electrical engineering optional subjects with fellow students. They offer a wealth of resources, opportunities to ask questions, and engage in discussions, making them valuable tools for enhancing your understanding of the subject. Remember to utilize these platforms responsibly and respect the guidelines of each community.