What is the lowest voltage that a neon test lamp can detect?

A neon test lamp is designed to indicate the presence of voltage through its ability to ionize the gas inside when a certain threshold is reached. Typically, a neon lamp will not illuminate until the voltage applied exceeds around 70-90 volts.

The correct choice of 80 volts represents a common threshold for these types of lamps, effectively allowing them to light up in circuits that are above this voltage level. Understanding the operational characteristics of a neon test lamp is vital for ensuring that you are testing voltages that are safely above the minimum detectable level while working on electrical systems.

In contexts where lower voltage detection is needed, other devices like low voltage testers or multimeters are typically used. The other provided voltage options either exceed what a neon test lamp can effectively react to or fall below its detection capabilities.