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What is a static switch?
A static switch is a switch that uses the electrostatic current that flows through the human body to power on or off the device.
Why an electric shock from a 240v supply can kill you but an 3000v DC supply from a static charge should not while walking across a nylon carpet and touching a metal door knock?
can dc volts kill you? It is in relationship to the amount of time the body is conducting the milliamp current. With your DC static charge, once the potential voltage has equalized by grounding the current flow stops. On a 240 volt system the voltage remains constant thereby causing the current to continually flow through the body. If you have ever has an electrical shock you know the feeling.
Why is an open ground so dangerous?
Current flows from the voltage source to ground. If an appliance is not grounded somehow the hot were to touch the metal case and you touched the case while standing on the ground then the current would try to travel to ground through your body. I once was called to debug a situation in a residence in Florida where the owner got a shock everytime he took a shower. Turns out the main electric panel had never been grounded to earth and thus the whole house was floating above earth ground. Essentially all the metal pmumbing was at about 60 volts above ground. When taking a shower the water stream conducted the current through the owner's body to the metal drain which was earth grounded.
What happens if you touch an exposed electrical wire?
If the wire is carrying an electrical current, and if the current has enough voltage, the current can leave the wire and pass through your body. This is painful, and can causes burns or death.
What part of the human body has the highest resistance to electrical current?
The Skin
How is static electricity differes from current electricity?
Static electricity is the BUILT UP STORE of electron charges [e-] between a pair of objects, while current electricity is the FLOW of electrons between these objects. Static electricity is a transfer of charge from one static body to another, resulting in an imbalance in positive and negative charges, while electric current is the flow of electrons, from one static body to another.
What is a static switch?
A static switch is a switch that uses the electrostatic current that flows through the human body to power on or off the device.
How does the build up of static electricity affect cars and how do they cope?
When you put your feet down and then touch the car when you get off, you will get a shock as your finger or hand almost touches the metal part of the car because you are grounded. The spark that jumps from the metal to your hand gives you the shock. The trick is to hold onto the metal part of a car and then get in. This way you won't be shocked because the electricity will flow over your body.
What is constrast static electricity?
Electrical current is the flow of electrons. "Static electricity" is more accurately called "static charge". It refers to the build up of a surplus of free electrons on a body (negative charge) , or the withdrawl of free electrons (positive charge). As the word "static" means, these charges are not moving, but are held stationary on the body. The measure of charge is the coulomb, which is 1.24 x 1018 electrons. If a charge is moving along a conductor, always from negative to positive, this flow of electrons is referred to as "current". The basic unit of current, is the amp. 1 amp is charge flowing at the rate of 1 coulomb per second.
Why an electric shock from a 240v supply can kill you but an 3000v DC supply from a static charge should not while walking across a nylon carpet and touching a metal door knock?
can dc volts kill you? It is in relationship to the amount of time the body is conducting the milliamp current. With your DC static charge, once the potential voltage has equalized by grounding the current flow stops. On a 240 volt system the voltage remains constant thereby causing the current to continually flow through the body. If you have ever has an electrical shock you know the feeling.
What do you understand by keyword 'this'?
"this" can only be used within the body of a non-static member function of a class and refers to the current instance of that class. Typically, we only refer to "this" instance when a non-static member function returns a reference to the current instance.
I get shocked constantly when I touch anything metal in the winter. It is very painful and produces sparks. What can I do to reduce the static electricity in my body in a dry climate?
Low humidity is related to more static forces.
How can you decrease the entropy of static body?
You can decrease the entropy of a static body by reducing the temperature.
When a person touches alive wire electrical current flows through his body how does this happen if the circuit is not complete?
Current may go to the ground, or another conductor. Also, your body may act as a capacitor, in other words, absorbing some current even if the circuit is not complete. Note that the normal household current is AC.
Is a coastline when water touches land?
Yes, it is. It is when a large body of water (an ocean) touches the land. :)
Why is the body of an oil tanker connected with a metal wire at the ground?
As fuel is pumped from the tanker car to a reservoir, charge can quickly build up as the fluid flows through the hoses. This static charge can create sparks capable of igniting the fuel. By connecting the body of the tanker car to the ground, the static charge can be transferred to the ground. A metal wire is used since metals are conductive and allow charge to flow through them.
Why a person safe from lightning inside a car that has a metal body?
A person is safe from lightning inside a car with a metal body because the metal acts as a Faraday cage. When lightning strikes the car, the metal body acts as a conductor, directing the electrical current around the occupants and safely into the ground, protecting them from electrocution.
