Electrical Q and A — "Phantom voltage," also known as "stray voltage" or "ghost voltage," is a phenomenon where a small amount of voltage is detected in an electrical circuit that should be completely de-energized.
This usually happens when there's a slight electrical potential difference between two points in the circuit due to induced voltage from nearby energized wires or equipment. The reason your socket light comes on dim when the switch is off could be related to phantom voltage. Here's a basic explanation:
When the switch is turned off, the circuit should be completely de-energized, but due to the proximity of other energized wires or equipment, a small amount of voltage is induced into the circuit.
This induced voltage, or phantom voltage, is typically insufficient to power most appliances but can cause sensitive electronics to behave strangely, such as a socket light turning on dimly.
The light turns on dimly because the small amount of induced voltage is enough to cause a small current to flow through the bulb, but not enough to illuminate it fully.
While phantom voltage is usually harmless, it can sometimes indicate a more serious problem, such as a faulty switch or wiring issue. If you're concerned or notice any other electrical anomalies, it's always best to consult a licensed electrician to inspect the wiring and ensure it's safe.
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