- Electrostatics
- Columb’s law
- Electric Flux density & Electric field intensity
- Magnetic Flux density &Magnetic field intensity
- Gauss law
- Energy density
- Continuity equation
- Magneto statics
- Biot- savart law
- Amperes circuit law
- Magnetic momentum & magnetic flux
- Boundary conditions
- Applications (Hall effect)
- Lorentz force equation
- conduction, polarization & magnetization
- Maxwell equations
- Law of conservation of charge & boundary conditions
- Hertzian dipole
A relay is an electrically operated switch. These are remote control electrical switches that are controlled by another switch. A relay is used to isolate one electrical circuit from another. It allows a low current control circuit to make or break an electrically isolated high current circuit path. The basic relay consists of a coil and a set of contacts. The most common relay coil is a length of magnet wire wrapped around a metal core. When voltage is applied to the coil, current passes through the wire and creates a magnetic field. This magnetic field pulls the contacts together and holds them there until the current flow in the coil has stopped. The diagram below shows the parts of a simple relay. Operation: When a current flows through the coil, the resulting magnetic field attracts an armature that is mechanically linked to a moving contact. The movement either makes or breaks a connection with a fixed contact. When the current is switched off, the armature is usually returned by...
[…] →2.1 Fundamentals of Electromagnetics […]
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