Lightning Rods

Source: TH

Context: In 2022, lightning strikes claimed 2,887 lives in India, highlighting the urgent need for safety measures. Petitions in India seek to classify lightning as a natural disaster, enabling better institutional support for affected individuals.

Geographical distribution of lightning in India:

• Lightning is not a notified disaster in India.

• High frequency regions: Northeastern states and eastern states (West Bengal, Jharkhand, Odisha) experience frequent lightning due to climatic factors.

• High fatality regions: Central Indian states like Madhya Pradesh, Maharashtra, Chhattisgarh, and Odisha report higher lightning-related deaths due to open agricultural fields.

• Most vulnerable state: Bihar faces the highest vulnerability, with significant fatalities annually due to population density and frequent thunderstorms.

• In World: Lake Maracaibo in Venezuela is the place on Earth that receives the most lightning strikes.

Science behind lightning rods:

• Electric potential and current flow: Electric current naturally flows from a region of higher electric potential (e.g., a charged cloud) to a lower electric potential (e.g., the earth).

• The earth as a ground: The earth serves as an abundant reservoir of low electric potential, capable of absorbing virtually infinite charges without becoming electrically saturated.

• Structure of the lightning rod: The rod is connected to a conductive wire that runs through the building and is grounded in the earth. This ensures the safe dissipation of electrical charges.

• Ionization of air: The sharp tip of the rod ionizes the surrounding air, creating a conductive path for the lightning discharge to follow, minimizing resistance.

• Energy dissipation: The rod channels the intense electric energy directly into the earth, preventing damage to the structure and surrounding environment.

• Protection mechanism: By being the path of least resistance, the rod attracts lightning strikes away from other nearby structures, ensuring safety.

• Types of Lightning Rods: Franklin Rods and Meshed Conductors: Use grids or spikes to dissipate the discharge. Early streamer emission (ESE) rods: Emit a continuous upward tracer to capture lightning more efficiently.

• Franklin Rods and Meshed Conductors: Use grids or spikes to dissipate the discharge.

• Early streamer emission (ESE) rods: Emit a continuous upward tracer to capture lightning more efficiently.

Insta Links:

• Upward-lightning