When I clench my left hand (fist), I feel a strong electric current in my ring finger.

If you have noticed a strong electric current sensation in your hand, especially when making a certain hand movement, and are experiencing other symptoms like weakness or pain, it may be a good idea to consult with a physiotherapist. They can assess the situation and develop a treatment plan to address the issue and prevent it from happening in the future. Most health insurance plans cover physiotherapy services, so it's worth looking into if needed.