Does a neon signal light have any resistance when checked with an ohmeter?

Does a neon signal light have any resistance when checked with an ohmeter?

• A. Yes
• B. No
• C. Only under load
• D. Resistance varies

Answer: (B)

A neon signal light does not have any measurable resistance when checked with an ohmmeter because it primarily functions as a gas discharge lamp. When the neon gas within the lamp is energized, it ionizes and allows current to flow freely, but under non-energized conditions, the overall resistance is extremely high, often approaching infinity. This characteristic leads to the situation where, when tested with an ohmmeter, no significant current can flow through the light, resulting in a reading of zero or no resistance. The lamp essentially acts as an open circuit until it reaches a certain voltage that ionizes the gas, which is why it does not show resistance in a typical measurement scenario. Additionally, neon lights are designed to indicate the presence of voltage rather than to conduct current, further emphasizing their high resistance properties when not under load.

A neon signal light does not have any measurable resistance when checked with an ohmmeter because it primarily functions as a gas discharge lamp. When the neon gas within the lamp is energized, it ionizes and allows current to flow freely, but under non-energized conditions, the overall resistance is extremely high, often approaching infinity.

This characteristic leads to the situation where, when tested with an ohmmeter, no significant current can flow through the light, resulting in a reading of zero or no resistance. The lamp essentially acts as an open circuit until it reaches a certain voltage that ionizes the gas, which is why it does not show resistance in a typical measurement scenario. Additionally, neon lights are designed to indicate the presence of voltage rather than to conduct current, further emphasizing their high resistance properties when not under load.