[Video] - Turning on light bulbs without any wired connection

[UltimaOnline]

Ask AI : why can light bulbs light up near power lines without a direct connection?

Fluorescent bulbs can light up near high-voltage power lines without a direct connection due to capacitive coupling, where the intense, oscillating electromagnetic field surrounding the lines induces enough electric current in the bulb's gas to ionize it and produce light. This is a wireless transfer of energy, not a direct connection.
Key reasons for this phenomenon:

• High Voltage Electromagnetic Field (EMF): High-voltage power lines generate strong electric and magnetic fields that extend into the air surrounding them.
• Capacitive Coupling: The rapidly alternating (AC) voltage in the power line causes a corresponding oscillation in the electric field, which acts on the electrons inside the fluorescent tube.
• Ionization: These fields are strong enough to ionize the low-pressure gas inside fluorescent tubes, forcing electrons to move and creating a faint glow.
• Efficiency of Fluorescent Lights: Fluorescent tubes require very little energy to operate compared to incandescent bulbs, making them efficient enough to light up from this weak induced energy.
• Optimal Conditions: The effect is strongest directly under high-voltage transmission lines and often requires holding the bulb vertically.

While the effect is mostly associated with fluorescent lamps, it is technically possible for other devices, but the voltage must be high enough to break down the airgap via the strong electric fields.