Final answer:
The electrode is likely touching the occipital lobe, which is responsible for processing visual information.
Step-by-step explanation:
The electrode that causes a conscious patient to see fireworks is likely touching the occipital lobe of the brain. The occipital lobe is responsible for processing visual information and is located at the back of the brain. When the electrode is activated, it stimulates the occipital lobe, leading to the sensation of seeing fireworks.