You may have heard it when turning on the lights, switching on the TV, or walking near the power lines. This is an unmistakable electric growl. But exactly what is that ham? And more importantly, is it a sign of danger?
The sound produced by electricity is called the “hum” and is caused by the way electricity is produced. The electricity coming from the power plant uses alternating current (AC). It is so named because the electric current turns or alternates many times per second.
The number of times the current alternates per second is Standards for a particular country.. In places such as the United States, Canada, and some Latin American countries, AC power is 60 hertz, or 60 shifts per second. In many other parts of the world, it alternates at 50 hertz, or 50 times per second.
According to Gary Woods, a professor of electricity, computer and engineering at Rice University, Texas, the hum you hear is typically about twice the frequency of AC power used.So in the United States, electricity is 120 hertz, or Between B and B flats Two octaves below center C. In Europe, it hums between A flat and G at 100 hertz, or two octaves below center C.
But to be precise, what is vibrating to create that ham?Normally Magnetic Elements in the device. For example, if you are near a power line, Electrical The high voltage from a power plant overloads home appliances because the hum produced by an electromagnetic device called a transformer is used to reduce the voltage of electricity when moving from a power plant to people’s homes. It is not.
“Inside the transformer is an inductor, which is just a magnetic element. It’s an electromagnet,” Woods told Live Science. “that is iron A coil of wire is wound. It’s in every transformer.
“as the reason for Electrical engineering, You need to have an electromagnet inside the device to get the functionality you want, “Woods told Live Science. ..And they are switching on and off [reversing their polarity] 60 times per second. So they are actually a little vibrating. “
According to Woods, the same thing happens with all kinds of electronic devices, from fluorescent lights to toaster ovens.
The reason why the power line itself makes a humming noise Another phenomenon called corona discharge.. This hum, or energy discharge, occurs when the electric field around the power line is greater than the electric field required to initiate the flow of current from the power line to the surrounding air. Water increases the conductivity of air, so the possibilities vary depending on the weather. Most modern power lines are designed to avoid this problem, at least in dry conditions. If a corona discharge occurs, it can be dangerous.There is evidence that corona discharge is possible Produces toxic gas like ozone, Hurts human lungs When inhaled.
But is the hum of your electronics a sign of danger?
“Maybe danger is too wordy,” Woods said. That hum is usually just the normal part of how an electronic device works. But sometimes it can be a clear sign that something is wrong.
“If you’ve never hummed before, and suddenly humming starts and grows bigger, it probably means that there’s something in your device that’s likely to fail,” Woods said.
“The air conditioner unit in my house started to make a hum of 60 hertz,” Woods said. “So I called the air conditioner repairman, and they said,” No, that’s nothing. ” And I said, “Well, no, when I heard that, I knew 60 hertz ham. Something was wrong.” And they came out, and certainly that There was a bad component inside, “Woods said.
Originally published on Live Science.
Why does electricity make a humming noise?
Source link Why does electricity make a humming noise?
The post Why does electricity make a humming noise? appeared first on Eminetra.