jänniteosoitin

Jänniteosoitin, often translated as voltage indicator or voltage tester, is a simple electrical device used to detect the presence of AC or DC voltage. It typically consists of a pointed probe or a pair of probes connected to an indicator, such as a light-emitting diode (LED) or a small neon lamp, and a resistor. When the probe(s) come into contact with a live electrical conductor, a small current flows, causing the indicator to light up, signaling that voltage is present.

These devices are primarily used for safety checks before working on electrical circuits or equipment. They provide a quick and easy way to confirm if a circuit is de-energized. More advanced versions may also indicate the approximate voltage level or distinguish between AC and DC. However, jänniteosoittimet are generally not used for precise voltage measurements, as their accuracy is limited. They are a common tool in the toolbox of electricians, maintenance personnel, and even DIY enthusiasts for basic electrical safety. It is crucial to note that a jänniteosoitin only indicates the presence of voltage; it does not confirm that a circuit is safe to touch, as other hazards may exist. Always follow proper lockout/tagout procedures when working with electricity.