Electrical Telegraph

Examples of Electrical Telegraph in the following topics:

• A Communications Revolution

  • The United States experienced a communication revolution in in the early 1800s, during which the penny press and the electrical telegraph emerged.
  • The penny press and the electrical telegraph were among the innovations that emerged during this communications revolution.
  • Congress appropriated $30,000 to fund an experimental telegraph line from Washington, D.C., to Baltimore, Maryland.
  • In May of 1844, Morse made the first public demonstration of his telegraph, sending the famous message, "What hath God wrought?"
  • The Morse-Vail telegraph was quickly deployed in the following two decades.

• Education and the Professions

  • Theodore Vail established the American Telephone & Telegraph Company.
  • Edison, the founder of General Electric, invented a remarkable number of electrical devices, including many hardware items used in the transmission, distribution and end uses of electricity as well as the integrated power plant capable of lighting multiple buildings simultaneously.

• The Inventions of the Telephone and Electricity

  • He was the first to obtain a patent, in 1876, for an "apparatus for transmitting vocal or other sounds telegraphically," after experimenting with many primitive sound transmitters and receivers.
  • Electric lighting in factories greatly improved working conditions, eliminating the heat and pollution caused by gas lighting, and reducing the fire hazard to the extent that cost of electricity for lighting was often offset by the reduction in fire insurance premiums.

• Electric Flux

  • Electric flux is the rate of flow of the electric field through a given area.
  • Electric flux is the rate of flow of the electric field through a given area (see ).
  • Electric flux is proportional to the number of electric field lines going through a virtual surface.
  • Electric flux has SI units of volt metres (V m), or, equivalently, newton metres squared per coulomb (N m2 C−1).
  • Electric flux visualized.

• Static Electricity, Charge, and the Conservation of Charge

  • Electric charge is a physical property that is perpetually conserved in amount; it can build up in matter, which creates static electricity.
  • Electric charge is a physical property of matter.
  • Electric charge is carried by subatomic particles such as electrons and protons, which can be created and destroyed.

• Electric Potential in Human

  • Electric potentials are commonly found in the body, across cell membranes and in the firing of neurons.
  • Electric potentials are not limited in function to inorganic processes.

• Electric Field and Changing Electric Potential

  • Electric field is the gradient of potential, which depends inversely upon distance of a given point of interest from a charge.
  • Electric field is the gradient of potential, which depends inversely upon distance of a given point of interest from a charge.

• Electric Fields and Conductors

  • Electric fields in the presence of conductors have several unique and not necessarily intuitive properties.
  • Electric fields are found around electric charges and help determine the direction and magnitude of force the charge exerts on a nearby charged particle.
  • Electrical conductors are materials in which internal charges can move freely.

• Properties of Electric Charges

  • Electric charge is a fundamental physical property of matter that has many parallels to mass.
  • Electric charge, like mass and volume, is a physical property of matter.
  • Electric charge is a property that produces forces that can attract or repel matter.

• Electric Generators

  • Electric generators convert mechanical energy to electrical energy; they induce an EMF by rotating a coil in a magnetic field.
  • Electric generators are devices that convert mechanical energy to electrical energy.