AboutDave Nyce Expertise I have been an electronics engineer for 25 years. I can answer questions on analog and digital circuits and my specialty is sensors.
Experience I am the inventor on 23 US patents, and also some foreign ones. Developed sensors for over 25 years. Licensed private pilot (airplane and rotorcraft), have HAM radio license. I'm not an expert in computer networking.
Question Hi Dave,
For what reason the plugs of normal electronics(e.g. radio,TV)
have TWO processes(made of metal)?
Why not only ONE process?
Answer I'm not sure what you mean by "process". If you mean the 2 or 3 metal contacts of the power plug, I'll explain.
One contact is the "hot" wire , another is "neutral". The electrical power is supplied from the hot wire and returns through the neutral wire. The hot wire changes from positive to negative at a rate of 50 or 60 times per second, depending on the country producing the power. 2 wires are needed to make a complete circuit, in which current is supplied from one wire and returns through the other wire.
Most appliances use a third wire for safety. This is the ground wire, and is connected to the neutral wire at the main power panel for your house. It is also connected to the housing of appliances that have a metal housing. If a hot wire comes loose in your appliance and touches a metal housing, the current to the ground wire causes your circuit breaker to trip. Thus, saving you from a shock if you touch the housing.
