Costochondritis: This condition, also known as Tietze's syndrome, is characterized by sharp pains in the chest that can be electric in nature, lasting a few seconds, and can occur multiple times an hour. The pain is typically localized to the costochondral junctions and does not worsen with breathing, fitting the description provided.

Musculoskeletal strain: Strains or minor injuries to the muscles or ligaments in the chest wall can cause sharp, fleeting pains that might be described as electric and do not necessarily worsen with breathing.
Gastroesophageal reflux disease (GERD): Although GERD typically presents with a burning sensation, some patients might describe their chest pain as sharp or electric, especially if it's related to transient lower esophageal sphincter relaxations.
Chest wall trauma: Minor trauma to the chest wall can cause localized pain that might be sharp and intermittent, not necessarily worsening with breathing.

Acute coronary syndrome (ACS): Although the pain described does not fit the classic presentation of ACS (which is typically a pressure or heaviness that may radiate and is often associated with exertion), atypical presentations can occur, especially in women, diabetics, and the elderly. It's crucial to consider ACS in any patient with new-onset chest pain.
Pulmonary embolism (PE): While the pain from a PE usually worsens with breathing, atypical presentations can occur. Given the potential lethality of PE, it should always be considered in the differential diagnosis of chest pain.
Aortic dissection: This is a medical emergency that can present with sudden, severe chest pain that might be described in various ways, including as electric. The classic description is a tearing sensation, but variations exist.

Herpes zoster (shingles): Before the rash appears, patients might experience sharp, stabbing pains in the distribution of the affected nerve, which could be mistaken for electric chest pain.
Pericarditis: Inflammation of the pericardium can cause sharp, stabbing chest pain that might not necessarily worsen with breathing. The pain often improves with leaning forward.
Esophageal spasm: This condition can cause sudden, severe chest pain that might be described as electric, though it's more commonly associated with difficulty swallowing or a sensation of food getting stuck.