A proximity switch works by emitting an electromagnetic field and monitoring it, activating whenever a sensor detects a change in the field. The activation of the sensor then sends an output or an electrical signal to switch on a light, alarm or device.Know More
Several types of proximity sensors exist, as different types are used to sense different kinds of objects. An inductive proximity sensor specializes in detecting metal objects like steel, brass and aluminum as they come into range. Capacitive sensors are more receptive to anything entering their fields, and can be used on things like plastics, liquids and even humans. There are also sensors for detecting magnets entering and leaving the field of the sensor.
Proximity switches have a wide variety of uses in industry and in everyday life. They are used in parking sensors for cars to alert drivers of low obstructions behind the bumper and in planes to detect the distance from the ground during landing. Inductive sensors are used for things like conveyor systems and in certain types of industrial piston engines. Small capacitive proximity sensors are used liberally in our everyday lives, such as within trackpads and touchscreens to eliminate accidental inputs. Smartphones also use proximity sensors to reduce radioactive emissions when the phone is close to people.Learn more about Electricity
An electric charge is a physical property of matter that causes other matter to experience a force when placed in an electromagnetic field. It is determined by whether an object has more electrons than it should have or fewer electrons than it should have. An excess of electrons gives an item a negative charge, while a lack of electrons makes the charge positive.Full Answer >
The electric field strength of a uniform electric field is constant throughout the field. A perfectly uniform electric field has no variations in the entire field and is unattainable in the real world. However, two parallel plates can generate a field that resembles a perfectly uniform field with slight variations near the edge of the plates.Full Answer >
Electric field lines are drawn around charges to represent the direction as well as the strength of the field around the charges. Equipotential lines are drawn perpendicular to each electric field line and connect the electric field lines at points where their field strengths or potential difference are equal.Full Answer >
Calculating electric field intensity requires the knowledge about the current charge level of the object that is making the electric field and the distance between that charged object and the measuring tool. Electric field intensity (or strength) is a vector quantity, which means it has direction as well as magnitude. The magnitude of this intensity comes from the way it is measured.Full Answer >